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Agreement for Cooperative Use of Communication Patents - Inline Connection Corp. and CAIS Inc.

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            AGREEMENT FOR COOPERATIVE USE OF COMMUNICATION PATENTS
                                        
                               November 5, 1996


PURCHASE OF AN OPTION TO OBTAIN INTELLECTUAL PROPERTY RIGHTS
------------------------------------------------------------

               WHEREAS, Inline Connection Corporation (hereinafter "Inline")
     owns patents in the United States and Canada and has filed patent
     applications in various countries describing new techniques for, among
     other things, communicating video and high data rate digital signals over
     twisted pair wires, including wires actively conducting voiceband
     communication (these patents and patent applications are listed in Appendix
     I) which patents and applications, together with all presently existing and
     hereafter created inventions, improvements or ideas related thereto and all
     subsequent modifications, divisions, continuations, re-issues, extensions,
     supplements and additions pertaining to or otherwise arising from such
     patents or applications being collectively referred to herein as the
     "twisted pair patents" or "TWP patents,"; and

               WHEREAS, CAIS, Inc., a Virginia corporation and/or CAIS Limited
     Partnership, a Virginia limited partnership (hereinafter "CAIS",) is in the
     business of providing Internet and telephone services and conducting other
     telecommunications business worldwide; and

               WHEREAS, CAIS or entities affiliated with either CAIS or certain
     of its principals (such entities being herein referred to as "CAIS
     Affiliates") desire to associate with Inline by reason of the ownership by
     Inline of the TWP patents; and

               WHEREAS, Inline and CAIS have an interest in exploiting the TWP
     patents for the mutual benefit of both parties.

               NOW, THEREFORE, in consideration of above premises and such other
     good and valuable consideration, the receipt and sufficiency of which being
     hereby acknowledged, the parties do hereby agree as follows:

                                       1
<PAGE>
 
1.   GRANT OF OPTION
     ---------------

     Inline hereby sells CAIS and CAIS hereby purchases from Inline an option
     (herein the "Option") under the terms defined below, to purchase rights to
     the TWP patents, under the terms that are set forth more fully below, for a
     total payment of FIFTY THOUSAND DOLLARS $50,000, which sum shall be payable
     to Inline concurrent upon execution hereof. Inline agrees promptly upon
     execution hereof to provide to CAIS without additional charge, both (i)
     complete copies of the patent applications, file histories and patents for
     each of the TWP patents, and (ii) reasonable assistance from Inline and its
     patent counsel in order to enable and facilitate the analysis by CAIS of
     the TWP patents.

The Terms of the Option:
----------------------- 

     1.1)   The period of the Option (the "Option Period") shall be four (4)
     months, beginning as of the date that this agreement is fully executed,
     unless the Option is sooner exercised or terminated in accordance with the
     provisions of this section.

     1.2)   Inline agrees to retain ownership and usage rights of the TWP
     patents during the Option Period, and not to compromise such ownership and
     usage rights in any way during this period, except that Inline shall
     provide CAIS, for consideration of the sum of $10, the rights to use by
     itself or any CAIS Affiliate the TWP patents in up to three (3) different
     buildings during the Option Period.

     1.3)   It is further agreed that CAIS shall be afforded sole rights to
     build, market and develop the TWP patents during the Option Period, and, if
     the Option shall be exercised, at all times thereafter except to the extent
     expressly provided below to the contrary.

     1.4)   David D. Goodman, president of Inline, agrees to work under the
     direction of CAIS during the first three months of the Option Period. Mr.
     Goodman agrees, in good faith, to assist CAIS in determining the general
     value of the TWP patents, the specific value of the TWP patents to the
     business operations of CAIS, and assist CAIS in any other manner that is
     related to the TWP patents.

     CAIS agrees to pay Inline $7500 per month (the "$7,500 Monthly Fee") during
     the first three months of the Option 

                                       2
<PAGE>
 
     Period, in return for Mr. Goodman's services. The three $7500 payments are
     due 15, 45, and 75 days after the date of purchase of the Option by CAIS,
     i.e., after execution of this Agreement.) There shall be no payment to
     Inline or other payment to Mr. Goodman during the fourth month of the
     Option Period.

     In consideration of such payments, Mr. Goodman agrees to devote full time
     efforts during the first three months of the Option Period for the services
     described above on behalf of CAIS, on an exclusive basis, with the
     understanding, however, that during this three month period, Mr. Goodman
     shall be entitled to complete before 8:00 a.m. and after 5:30 p.m. on
     Mondays-Fridays and during all hours on Saturdays and Sundays a maximum of
     two weeks of programming for America Online.  No services shall be required
     of Inline or Goodman during the fourth month; however, neither party shall
     provide services to any other person, firm or corporation during any
     portion of such four month period involving the TWP patents or any
     applications thereof described in this Agreement.

     1.5)   CAIS can elect to forfeit the Option at any time. Should it elect to
forfeit, such forfeiture shall be done by written notice from CAIS sent to
Inline, referring specifically to this section. In the event of forfeiture by
CAIS as aforesaid, CAIS shall be relieved of obligations to pay any amounts that
have not come due, whereupon the license, defined above, entitling CAIS to use
the TWP patents in up to three (3) different buildings, shall expire upon
expiration of five (5) days thereafter. Should CAIS elect to forfeit the Option
hereunder, neither party shall thereafter be bound to one another under this
Agreement, with the exception that both Inline and Goodman shall indemnify and
hold harmless CAIS and the CAIS Affiliates from any infringement or similar
claims arising by reason of their use of the TWP patents during the Option
Period, and such obligation shall expressly survive termination hereof;
provided, however that as a condition to the agreement of Inline and Goodman to
provide such indemnity, CAIS agrees during the Option Period to:

          (i)   comply with any written specifications provided to CAIS by 
            Inline with respect to implementation of the technology licensed 
            hereunder;

                                       3
<PAGE>
 
          (ii)  notify Inline promptly following receipt by CAIS of any such
            notice of infringement or similar claim; and

          (iii) following receipt by CAIS of such notice, reduce, alter or cease
            exercise of the rights provided by the TWP Patents, in accordance
            with Inline's written instructions.

Exercise of the Option (i.e. Purchase of Patent Rights):
------------------------------------------------------- 

     1.6)   CAIS shall be entitled to exercise its Option at any time during the
     Option Period, by payment of $50,000 (Fifty Thousand Dollars) to Inline.
     (The amount paid for the Option at the time of execution hereunder does not
     count towards this payment.) In addition, CAIS shall also concurrently pay
     the pro-rated then unpaid portion of the $7,500 Monthly Fee required above,
     if any such fee has not been theretofore paid, for work performed during
     the Option Period.

     1.7)   Upon exercise of the Option, all intellectual property rights
     pertaining to or otherwise arising from the TWP patents shall be deemed
     exclusively licensed to CAIS, under the terms defined in the sections
     below.  This Agreement shall terminate only under the provisions that are
     also defined below.

2.   INTELLECTUAL PROPERTY RIGHTS GRANTED TO CAIS
     --------------------------------------------

     Should the Option be exercised as aforesaid, CAIS shall be deemed granted
     by Inline an exclusive license to use, make, sub-license, or sell, on a
     world-wide basis, in such manner or manners as CAIS shall in its sole and
     exclusive discretion determine necessary, desirable or appropriate, any
     technology covered by the TWP patents, subject only to those express
     geographic and pre-existing contract limitations described below in this
     section 2;  recognizing, however, that as a material inducement to CAIS
     hereunder, Inline and Goodman represent and warrant that to the best of
     their knowledge, none of the pre-existing contract limitations to which
     this exclusive license shall be subject shall either

(A) adversely affect in any material manner, the right of CAIS to use, make,
sub-license or sell any such technology other than within:

                                       4
<PAGE>
 
          (i)   single family residential units [as opposed to multi family
          properties such as (by way of example and not in limitation)
          condominiums, apartments, hospitals, nursing homes, prisons, and
          hotels],

          (ii)   bars, restaurants, coffee shops and other business
          establishments earning at least ninety percent (90%) of their revenues
          from the sale of food and beverages consumed on their premises;

or (B) impose upon CAIS or its sub-licensees any obligations, duties or
limitations other than as described in (A) above.

     The restrictions set forth above in 2(A) and 2(B) are collectively referred
     to as the "Pre-Existing Contract Restrictions".

     In the event Inline or Goodman are found to have breached their
     representations under either this Section or in Section 15 below, (i.e. it
     shall be determined that either Inline or Goodman had knowledge of a pre-
     existing contract limitation or other patent holder which infringes on the
     ability of CAIS to use the technology to be licensed hereunder), then and
     in such event CAIS shall be entitled to recover all damages suffered or
     incurred by reason of such breach, including without limitation recovery of
     all sums paid to Inline and/or Goodman hereunder.

     The express limitations to which this exclusive license shall remain
     subject are as follows:

Geographic Limitations:
---------------------- 

     Rights to use, make, sub-license or sell the technology covered by the TWP
     patents (the "TWP Technology"), in the country of Israel shall be retained
     by Inline.
    
     CAIS further agrees that it shall not use, sub-license, make or sell the
     TWP Technology in either Germany  or Austria without the express prior
     written consent of Inline, which consent shall be granted or withheld by
     Inline in its sole and exclusive discretion, recognizing that at this time
     Inline prefers not to use or permit any other party to use the TWP
     Technology in such countries.      
    
     In no event shall the foregoing reservations pertaining to Germany or
     Austria be interpreted as granting any party      

                                       5
<PAGE>
 
     
     other than CAIS the right to use, make or sell the TWP Technology in
     Germany and/or Austria.      

Limitations Imposed by Pre-Existing Contracts:
--------------------------------------------- 

     Subject to the rights of CAIS to recover for the benefit of both CAIS and
     Inline all or such portion of the "Terk Rights" (as described in section 3
     below) determined by CAIS necessary, desirable or appropriate, the
     intellectual property rights transferred under this Agreement do not
     include the following rights transferred by Inline Connection Corporation
     to Terk Technologies, of Plainview, NY, (hereinafter Terk) as part of a
     contract between Terk and Inline executed in 1995, namely:

     the right to build, use or sell products that transmit one or more signals
     onto twisted pair wires at frequencies above 3 Khz, and products that
     receive one or more signals at frequencies above 3 Khz, by connection to
     twisted pair wires within the specific field of use strictly confined to
     residential settings (but not multi-family residential settings as
     described above) and bars, restaurants, coffee shops and other business
     establishments earning at least ninety percent of their revenues from the
     sale of food and beverages consumed on premises.

     A true and complete copy of that contract (the "Terk-Inline Agreement") is
     hereby represented by Inline as being attached hereto.

     The parties hereby recognize and agree that the limitations set forth above
     shall not be deemed to subject CAIS or its

     sub-licensees to any liability, claim or damage by reason of the failure of
     their particular purchaser, or any subsequent user of any product sold by
     CAIS or its sub-licensees hereunder to limit the use of such product in
     accordance with the geographical or pre-existing contract limitations set
     forth above.  CAIS and its sublicensees must print the following language
     on the exterior packaging of any such product:

     "Purchaser (or licensee) agrees not to use this product in detached single-
     family residential structures, and also agrees not to use this product in
     business establishments earning at least 90% of their revenues from the
     sale of food and beverages consumed on premises."

                                       6
<PAGE>
 
     This paragraph shall be placed in all agreements to resell or sub-license
     this product.  This paragraph is the only agreement on its subject and
     shall supersede all contradictory agreements.  It may be enforced by Inline
     Connection Corporation.  CAIS agrees to adhere to the above paragraph and
     to place the label language and the resale agreement restriction language
     in all sales contracts or other agreements relating to the products.  CAIS
     shall be released from any claims for any violation of the terms of this
     section if this paragraph was included in the contract to license or sell
     the violating products and the appropriate markings were made on any
     products sold by CAIS.  The limitations described in the immediately
     preceding sentence are referred to below as the "Limitation Exceptions".
     The Limitation Exceptions shall in no manner affect the rights of CAIS to
     share commissions, fees or royalties as set forth below in Section 3.

3.   RIGHTS TO PURSUE RECOVERY OF TERK RIGHTS
     ----------------------------------------

     Upon exercise of the Option granted herein, Inline agrees that CAIS shall
     be entitled to take good faith action to negotiate with Terk and take other
     such appropriate action to recover all or any of the rights transferred to
     Terk under the Terk-Inline Agreement (herein the "Terk Rights").  CAIS
     agrees that any agreement to be entered into with Terk related to the
     transfer of the Terk Rights shall require the transfer of such rights so
     that they become part of the TWP patent rights subject to this Agreement.
     Further, CAIS shall consult with Inline prior to initiating any lawsuits or
     other court or arbitration proceedings against Terk in connection with
     recovery of the Terk Rights, and CAIS shall consult with Inline throughout
     such proceedings; provided, however that if CAIS does not receive any
     written objections within three business days following written notice to
     Inline hereunder, Inline shall be deemed to have waived its rights to
     discuss with CAIS the initiation of such claim or proceeding. CAIS shall be
     entitled in its sole and exclusive discretion to either abandon such
     actions, or to fund in whole or in part with Inline sums in connection with
     such negotiations or arbitration proceedings.  Inline agrees to fully
     cooperate with CAIS, at no additional charge to CAIS, at anytime subsequent
     to the exercise by CAIS of its option rights hereunder, in all such
     negotiations and/or arbitration proceedings.  In no event shall Inline
     modify, 

                                       7
<PAGE>
 
     alter or change in any manner any of the terms, provisions or conditions
     set forth in the Terk Agreement during the term of this Agreement, nor
     waive or exercise any of its rights thereunder, absent the express written
     consent of CAIS. All rights recovered from Terk hereunder shall be governed
     by this Agreement, recognizing, however that (i) CAIS shall be entitled to
     recover all "Reimbursable Costs" (below defined) incurred in connection
     with any such negotiation or arbitration from the first royalties arising
     from recovery of any such rights prior to Inline receiving its share of
     such royalties; (ii) Inline shall thereafter be entitled to recover those
     funds, if any, elected by Inline in its sole discretion to be advanced to
     third parties in connection with such arbitration or negotiations from the
     royalties received subsequent to the reimbursement to CAIS under (i) above;
     and (iii) any royalties earned after the CAIS option has been exercised
     under the Terk-Inline Agreement, subsequent to the allocation of such
     royalties to the recoveries provided for in (I) and (ii), shall be
     allocated either 50% to Inline and 50% to CAIS, or 75% to CAIS and 25% to
     Inline, as more fully set forth below, provided, however, that the first
     $50,000 of such royalties, subsequent to the allocations to the recoveries
     provided for in (I) and (ii), shall be allocated to Inline. For purposes
     hereof, Reimbursable Costs shall be defined as legal costs and expenses,
     any direct travel, food or lodging costs, expert witness charges and
     expenses, and other costs paid to unrelated third parties. In addition,
     following the written consent of Inline, which consent shall not be
     unreasonably withheld, delayed or conditioned, Reimbursable Costs may also
     include reimbursement of sums or benefits paid or provided to CAIS
     employees providing services related to the pursuit of the Terk Rights. In
     the event Inline fails to respond within five (5) business days following
     written request, Inline shall be deemed to have consented to the
     expenditure of the particular cost or expense requested by CAIS to be
     reimbursed.

     The parties expressly agree that CAIS shall participate on a "fifty-fifty"
     basis with Inline to the extent Inline receives any commissions, fees or
     royalties of any nature subsequent to the exercise by CAIS of the Option,
     and Inline hereby agrees to remit to CAIS (or credit against the
     obligations of CAIS hereunder) one-half of all such amounts received by
     Inline under the Terk Agreement.  Notwithstanding the foregoing, to the
     extent any provision of the Terk Agreement shall be determined by a court
     of 

                                       8
<PAGE>
 
     competent jurisdiction to restrict CAIS or any CAIS Affiliate from
     exploiting the technology hereunder in a manner more restrictive than as
     defined within the Pre-Existing Contract Restrictions, and as a result
     thereof Terk or its designee exploits such technology in the restricted
     manner, then to the extent Inline receives any commissions, fees or
     royalties of any nature subsequent to the exercise by CAIS of the Option
     attributable to such restricted exploitation, CAIS shall participate as to
     a three-fourths share thereof (as opposed to the one-half share provided in
     the preceding sentence) with Inline receiving the remaining one-fourth
     share.

4.   CAIS OBLIGATIONS TO FUND R&D
     ----------------------------

     CAIS agrees to expend up to $200,000 for R&D efforts for the design of a
     reliable, seamless and affordable TWP System, incorporating the technology
     of the TWP patents, to deliver high speed video and data to end users
     utilizing existing twisted pair phone wire.  The TWP System shall consist
     of several basic components including, but not limited to, the base
     station, the source server, FM transmitters, the switching hub, and
     enhanced wire jacks.  Development of the TWP System is to include the
     design and prototyping of inline production models of all commercially
     unavailable equipment required to implement the TWP System.  It is
     recognized that it will not be necessary for all of the components required
     for operation of the TWP System to be designed and custom prototyped, to
     the extent that there already exists commercially available equipment that
     will meet the needs of the TWP System and that can be integrated into the
     TWP System.

     The TWP System to be developed must have the following attributes:
     commercial reliability, ease of installation, ease of upgrade and ease of
     maintenance.  Because the system will attach to the telephone network, it
     must be designed to meet any FCC certification and other requirements.  The
     TWP System and its components should be built to meet all applicable legal,
     regulatory and industry requirements and standards.  All components must be
     designed such that the mean time between failures (MTBF) is on the order of
     30 minutes every 20 years.  The TWP System must be designed for flexibility
     and able to accommodate the moves, adds, and changes that will be required
     due to the inherent dynamic nature of buildings where the TWP System will
     be installed.

                                       9
<PAGE>
 
     It is recognized that Inline and CAIS shall work together with the intent
     that the TWP System be produced in accordance with the above specifications
     at the lowest cost reasonably possible.

     Within 14 days following CAIS's exercise of the option pursuant to section
     1.6, Inline shall submit to CAIS a proposed R&D plan and budget, which
     shall be subject to CAIS's approval, which shall not be unreasonably
     withheld.  Inline agrees that all material contracts, purchase orders, and
     similar agreements to be entered into pursuant to and in implementation of
     the R&D plan and budget shall be submitted to CAIS for CAIS's prior
     approval, which shall not be unreasonably withheld or delayed.

     CAIS shall be entitled to control the disbursement of payments made in
     furtherance of the R&D plan and budget, but shall nevertheless report to
     Inline on a monthly basis the amounts and recipients of all disbursements
     therefrom. CAIS agrees to disburse payments consistent with timely
     implementation of the R&D plan and budget.

     It is specifically recognized and agreed by the parties that the $200,000
     shall be used by CAIS solely in connection with research and development,
     as aforesaid.  CAIS hereby agrees to commit to spend up to $200,000 during
     the nine (9) months period following the date of the exercise of the
     Option.  CAIS shall be entitled to consider for purposes of such
     expenditures twenty percent (20%) of the monthly fees payable to Goodman
     (or Inline) for Mr. Goodman's services, pursuant to section 5 below, until
     completion of the TWP System. Inline shall use its best efforts to complete
     within such nine (9) months period the development of the TWP System. In
     the event the TWP System is developed before the expenditure of the
     $200,000, then and in such event CAIS shall be entitled to a preferential
     reimbursement right to recover from the royalties otherwise first
     receivable by Inline hereunder all sums spent for research and development
     not in excess of $200,000. In the event CAIS shall expend the full $200,000
     hereunder, and CAIS shall elect in its sole discretion to advance
     additional funds, CAIS shall be afforded a preferential reimbursement right
     from the royalties otherwise first receivable by Inline to recover both
     (i)all such excess funds that CAIS chooses to advance not in excess of One
     Hundred Thousand Dollars ($100,000), together with interest thereon from
     the date advanced at eight percent (8%) per annum until recovered, together
     with 

                                       10
<PAGE>
 
     (ii) the initial $200,000 expended by CAIS hereunder. For purposes of
     this Agreement, "preferential reimbursement right", unless otherwise
     specified, shall mean that CAIS shall be entitled to receive and apply to
     such recovery seventy-five percent (75%) of the royalties otherwise first
     receivable by Inline.

     If after $200,000 has been expended on R&D efforts the TWP System has not
     been completed, CAIS shall also be entitled to terminate its rights
     hereunder at any time thereafter prior to completion of the TWP System by
     written notice to Inline, with the understanding nevertheless that during
     the ten (10) year period subsequent to such termination CAIS shall be
     entitled to a non-exclusive license to use any of the patent rights itself,
     or it can trade rights to use the TWP Technology for distribution of
     signals to end users.  The consideration CAIS receives in return for such a
     trade must include the right and obligation to provide substantial
     information services to these end-users, either directly or through a third
     party.  CAIS shall compensate Inline, for all fees collected for such
     services, according to the schedules that apply prior to termination,
     provided that CAIS shall be entitled to a Most Favored Nation adjustment of
     such fees to the extent Inline agrees to more favorable terms with any
     third party.  Inline shall inform CAIS of any such third party agreement
     within 30 days of the date Inline enters into any such agreement.

     In addition, notwithstanding any such termination by CAIS hereunder, should
     Inline subsequently receive any royalties related to the TWP Patents, CAIS
     shall remain entitled to a preferential reimbursement right from the
     royalties otherwise receivable by Inline to recover therefrom all
     expenditures for research and development made by CAIS not in excess of
     $300,000, to the extent that CAIS shall be entitled to receive and apply to
     such recovery fifty percent (50%) of the royalties otherwise first
     receivable by Inline.  The parties expressly recognize that the provisions
     contained in this paragraph shall survive any termination of this Agreement
     and shall be fully enforceable by CAIS.

5.   INLINE OBLIGATIONS TO PROVIDE CONSULTING SERVICES
     -------------------------------------------------

     David D. Goodman, president of Inline, agrees to work full time and
     exclusively under the direction of CAIS, for the first two years (the
     "Consulting Period") following exercise 

                                       11
<PAGE>
 
     by CAIS of the Option, subject to extension in the event the TWP System is
     not developed within the initial nine month period following the exercise
     of the Option. Inline shall be paid $8,500 per month for the services of
     Mr. Goodman during the first nine months of the Consulting Period, and
     provided the TWP System has been theretofore completed, a similar amount
     for each of the three months elapsing thereafter. Inline shall be entitled
     to receive during the last twelve months of the Consulting Period the sum
     of $10,000 per month. In the event the TWP System has not been completed
     within such nine month period, the aforesaid monthly fee shall be abated in
     its entirety until such time as the TWP System has been developed.
     Following development of the TWP System, the Consulting Period shall be
     deemed extended by the number of months delay between the expiration of the
     ninth month of the Consulting Period and the month in which such TWP System
     is developed. Further, in the event the Consulting Period is extended as
     aforesaid, Mr. Goodman shall receive during each of the three months
     following the month in which the TWP System is developed a monthly fee of
     $8,500, together with the $10,000 per month fees payable for each of the
     twelve months elapsing beyond such three month period. Mr. Goodman shall
     not be required to work under the direction of CAIS subsequent to
     expiration of the Consulting Period; however, neither Mr. Goodman nor
     Inline shall offer or provide, either directly or indirectly, to any other
     person, firm or corporation at anytime during the term of the exclusive
     license acquired by CAIS hereunder, any rights or services pertaining to or
     in competition with the TWP patents (except to the extent required by Terk
     in accordance with the presently existing terms under the Terk Agreement).
     The parties expressly agree that CAIS or its assigns shall be entitled to
     injunctive relief, in addition to and not in limitation of any other rights
     or remedies available at law or in equity as a result of the breach or
     planned breach by Mr. Goodman or Inline of its obligations hereunder.
     Following development of the TWP System, Mr. Goodman shall be entitled to
     reside in Israel up to two (2) months per calendar year provided that he
     continues to fulfill his obligations and duties hereunder. Further, Mr.
     Goodman agrees to cooperate with CAIS at its request as a consultant at all
     times subsequent to the expiration of the Consulting Period, with the
     understanding that Mr. Goodman would be entitled to receive fair
     compensation for any such services in the event the services were to become
     substantial in duration. In the event that, prior to the expiration of the
     Consulting Period, CAIS pays 

                                       12
<PAGE>
 
     Inline sufficient royalties so that CAIS, pursuant to section 11 below, has
     secured a 50% ownership interest in the TWP patents, Mr. Goodman may elect
     to work only half-time during the remainder of the Consulting Period, with
     the monthly consulting fees payable to Inline proportionately reduced
     during such remaining period.

6.   CAIS OBLIGATIONS TO FULLY EXPLOIT THE PATENTS
     ---------------------------------------------

     CAIS agrees to use all reasonable efforts to exploit the technology being
     licensed hereby in the United States and in those countries where patent
     protection has been granted.  CAIS agrees to confer with any potential
     licensees introduced to CAIS by either Goodman or Inline, recognizing,
     however that CAIS shall reserve the sole and exclusive discretion to
     reject, modify or accept the offered terms. CAIS agrees not to suppress the
     sale or trade of the product.  Such action shall constitute a breach of
     this agreement after proper notice and failure to cure such breach within a
     reasonable period thereafter.

7.   COMPENSATION OF INLINE
     ----------------------

     Subject to the provisions of subsection 7.6 below,  Inline shall be
     compensated for use of the TWP rights in accordance with the royalty
     payment chart (the "Royalty Chart") contained in Appendix II attached
     hereto and made a part hereof, in the following manner:

     7.1)   Inline shall receive a royalty based upon the sales price of any
     hardware, sold by CAIS or a CAIS Affiliate, that is covered by the TWP
     patents and communicates video or high speed (> 64Kbps) data over twisted
     pair wires that are actively being used for voiceband communication, such
     royalty to be determined in accordance with column D of the Royalty Chart.

     The sales prices shall be the wholesale price received by CAIS for goods
     utilizing the technology licensed to CAIS hereunder, but excluding amounts
     either received or provided for freight, or insurance incurred to ship the
     product to the customer, sales, value-added or use taxes, returns,
     discounts, allowances, bad debts, items sold at or near cost as an
     incentive to provide future services commissionable hereunder, and other
     similar items.  In the case of integral products manufactured by parties
     other than CAIS or CAIS Affiliates, the sales price shall be based upon the

                                       13
<PAGE>
 
     wholesale price received by CAIS for the particular individual component,
     utilizing the technology licensed to CAIS and making up a part of the
     integral product.  In the case of integral products manufactured by CAIS or
     CAIS Affiliates, the sales price shall be computed based upon 
     the value added by inclusion of the particular individual component
     utilizing the technology licensed to CAIS and making up a part of the
     integral product.

     For example, Bell Atlantic licenses the rights to use the internal
     distribution technology in Montgomery County and, as part of the
     transaction, is allowed to purchase up to 10,000 FM Video transmitters from
     CAIS.

     7.2)   Inline shall receive a royalty determined under column E of the
     Royalty Chart based upon a percentage of the fees collected by CAIS or a
     CAIS Affiliate to the extent such fees are for Internet or other
     information services, video services, or digital audio radio services,
     provided under any contract, agreement, or similar arrangement that
     involves transfer of TWP patent rights as provided in section 2 of this
     Agreement. Further, amounts either received or provided for items such as
     discounts, allowances, bad debts, refunds, credits, sales, use or value
     added taxes, shall be deducted from fees received for purposes of
     determining the royalty obligations hereunder.

     For example,

     *  in return for an agreement to use CAIS as its ISP, an

       apartment management company in Washington, DC receives the rights to buy
       and use hardware that distributes Ethernet signals over the internal
       telephone wires of its apartment buildings,

     * CAIS contracts with company ABC to provide Internet services to the
       20,000 tenants in the apartment buildings that ABC owns in Chicago, and
       CAIS takes on the obligation to manage the distribution hardware as part
       of the deal.  Later, CAIS buys video signals from DirecTV and contracts
       with ABC to resell these video signals to the tenants using the hardware
       it manages.


     7.3)   In specific cases, Inline shall receive as a royalty a percentage of
     the fees according to Column F of the 

                                       14
<PAGE>
 
     Royalty Chart, collected by CAIS or CAIS Affiliates for provision of
     information services, when such services that are *NOT* covered under
     section 7.2 above, only to the extent that the fees collected by CAIS would
     not otherwise have been received by CAIS or a CAIS Affiliate in the absence
     of the licensing to CAIS or such CAIS Affiliate of the TWP patents.
     Specifically, Inline will receive a percentage of fees when CAIS provides
     information services, directly or indirectly, to end-users in structures
     that have secured the rights to use hardware, covered by the TWP patents,
     to receive a DIFFERENT type of service. For example,

     A hotel company contracts with CAIS by reason of the grant to CAIS of the
     exclusive license hereunder for the rights to purchase, install, and use,
     in their hotel structures, Ethernet distribution hardware that is covered
     by the TWP patents.  In addition, as a byproduct of the aforesaid
     relationship, the hotel company agrees to purchase Internet services from
     an ISP supplied by CAIS.  Should the same hotel company subsequently elect
     to contract with CAIS for provision of long-distance telephone services,
     Inline shall receive a percentage of the fees for such services according
     column F, even though the second contract does not involve Inline patent
     rights.  However, if such hotel company was attracted to CAIS or a CAIS
     Affiliate initially because of services other than those relating to the
     TWP patents, Inline shall not be entitled to receive any portion of the
     fees derived from such other services.

     For another example, CAIS contracts with company ABC to provide Internet
     services to the 20,000 tenants in the apartment buildings that ABC owns in
     Chicago, and CAIS does not, at the time the contract was signed, provide
     telephone services on a building-wide basis to any of these apartment
     buildings.  CAIS later contracts to provide telephone services to five of
     the buildings that house these tenants.

     7.4)   Inline shall receive royalties determined under column G of the
     Royalty Chart, based upon the sums collected by CAIS or a CAIS Affiliate
     from third parties, for the rights to use, make, or sell all hardware,
     covered by the TWP patents, that communicate signals INTERNAL to a
     structure in circumstances where both (1) a third party, and not CAIS or a
     CAIS Affiliate, is the underlying provider of the hardware system utilizing
     the TWP Technology that is installed in such structure, but CAIS or a CAIS
     affiliate is 

                                       15
<PAGE>
 
     paid for the right to use such hardware on an on-going basis (as opposed to
     the initial acquisition costs of such hardware), and (2) a third party, and
     not CAIS or a CAIS Affiliate, is the underlying provider of the Internet or
     other information service, video service, or digital audio radio service
     that is delivered to end users in the structure by use of the TWP
     Technology that is installed in such structure. There shall be deducted in
     determining the sums received by CAIS or a CAIS Affiliate for purposes of
     both this subsection 7.4 and subsection 7.5 below, all items such as
     discounts, allowances, bad debts, refunds, credits, sales, use or value
     added taxes. For example, Bell Atlantic licenses from CAIS the rights to
     use the TWP technology in Montgomery County, and pays CAIS $100,000 for
     such rights, where Bell Atlantic, and not CAIS or a CAIS affiliate, is the
     underlying provider of the hardware system to be installed in the buildings
     in Montgomery County, and where Bell Atlantic or other third parties, and
     not CAIS or a CAIS affiliate, is the underlying provider of the Internet
     and other information services to the end users in such buildings.

     In addition, Inline shall receive royalties determined under column G of
     the Royalty Chart, based upon the sums collected by CAIS or a CAIS
     Affiliate from third parties, where CAIS licenses a third party to make and
     sell hardware covered by the TWP patents, and such party can, as part of
     the license, grant purchasers of such hardware an unlimited license to use
     such hardware.

     7.5)   After reimbursement to CAIS or the CAIS Affiliate of all costs
     incurred for legal fees, and any other non-recurring cost in connection
     with procuring or retaining agreements with third parties for same, Inline
     shall receive as a royalty hereunder a portion of the royalties (or other
     payments) collected from such third parties by CAIS or a CAIS Affiliate
     determined in accordance with column H of the Royalty Chart for the rights
     to use, make, or sell all hardware, covered by the TWP patents, that
     communicates signals between two points external to structures, between two
     separate structures, or between a point outside (and substantially removed
     from) a structure and a point internal to the structure.  This shall
     include, specifically but not exclusively, rights to use, make, or sell
     ADSL hardware.    In the event either CAIS or Inline become aware of
     another party providing video services to no less than 10,000 

                                       16
<PAGE>
 
     subscribers using ADSL hardware, CAIS, at its option, shall attempt to
     enforce the TWP Patent rights licensed hereunder within a reasonable time
     period thereafter or in lieu thereof, Inline shall be free to do so. Should
     Inline successfully maintain the enforcement action, it shall be entitled
     to recover from the next royalties payable hereunder its legal fees and
     other non-recurring costs in connection with such pursuit. CAIS and Inline
     agree to confer with one another from time to time in order to evaluate the
     appropriate course of conduct.

     7.6)   Notwithstanding any provision contained to the contrary hereinabove,
     CAIS or CAIS Affiliates shall be entitled to enter into licenses and/or
     sub-licenses with educational or other non-profit institutions (herein
     collectively the "Qualifying Institutions") on a cost-only basis (i.e. at a
     price calculated with the intent to provide the goods or services to the
     Qualifying Institution without any profit or markup to CAIS or the CAIS
     Affiliate) to receive products or information services using the technology
     licensed hereunder.  In such event, all payments received by CAIS or the
     CAIS Affiliate shall be disregarded in determining royalty payments to
     Inline hereunder and in lieu thereof, Inline shall be entitled to 50% of
     the royalty which would have resulted had the Qualifying Institution not
     been provided pricing on a cost-only basis.

     7.7)   To the extent CAIS or a CAIS Affiliate receives consideration
     provided in kind as opposed to in cash, such consideration shall be valued
     at fair market value when received for purposes of computing the royalties
     to which Inline shall be entitled hereunder.

     7.8)   In any country not protected by a patent or patent application, the
     royalty rate reflected on the Royalty Chart shall be reduced in respect of
     goods manufactured or sold for use in such country should it become clear
     that competitors have entered the market in such country.  The reduction
     shall be negotiated by the parties upon a determination that a competitor
     has entered the market and a determination of the anticipated effect that
     the competitor has in that market.  The royalty rate may be reduced further
     based on the impact that the competitor has on the ability of CAIS or a
     sub-licensee to compete in that market.

8.   MINIMUM ANNUAL ROYALTIES
     -------------------------

                                       17
<PAGE>
 
     CAIS shall be obligated to pay Inline a minimum annual royalty according to
     the following schedule:

     $100,000 on the first anniversary of delivery of the TWP System as defined
     in section  "CAIS Obligation to Fund R&D"

          $150,000 on the 2nd anniversary,
          $200,000 on the 3rd anniversary,
          $250,000 on each anniversary thereafter.

     Failure to pay the minimum royalty shall result in the breach by CAIS
     hereunder, if not cured within fifteen (15) days following written notice
     to CAIS.

9.   TERMINATION OF THE AGREEMENT
     ----------------------------

     CAIS shall be entitled to terminate the license at anytime upon no less
     than thirty (30) days written notice.  However, no such termination shall
     adversely affect any existing sub-licenses nor the obligation of the
     licensee to pay Inline (or CAIS) any unpaid accrued fees hereunder. This
     agreement will self-terminate upon the lapse of the last Inline patent in
     Appendix I.

10.  NEW INTELLECTUAL PROPERTY
     -------------------------

     Subject to the provisions of the following sentence, new intellectual
     property conceived by David D. Goodman (or other Inline personnel including
     without limitation Messrs. Woodward and Domnitz) during the period of this
     agreement shall become, upon conception, property of Inline Connection
     Corporation, whether or not such property was conceived during the course
     of Mr. Goodman's work under this Agreement.  It is expressly recognized
     that Inline personnel shall not be considered as employees of CAIS by
     reason of this Agreement.

     If intellectual property, trade secrets and proprietary know-how is
     conceived or acquired by David D. Goodman or other Inline personnel during
     the term of this Agreement relating to communication over twisted pair
     wires at frequencies above the common voiceband, or if new patent
     applications are filed by any of these people on such subject matters,
     these new rights shall be deemed to be a part of the TWP patents, listed in
     Appendix I, and shall be governed by the terms of this Agreement from and
     after the 

                                       18
<PAGE>
 
     date conceived or acquired. As such, they shall be subject to the "Joint
     Ownership of Patent rights" clause of this Agreement, which is defined
     below.

     New intellectual property obtained or created by CAIS or any CAIS Affiliate
     during the period of this Agreement that relates to communication internal
     to a structure over twisted pair wires at frequencies above the common
     voiceband shall remain property of CAIS or such CAIS Affiliate and will be
     scheduled in Appendix I.  Rights provided by such property, however, shall
     be governed in the same manner as rights provided by the TWP patents,
     listed in Appendix I.  In the event that this Agreement is terminated prior
     to the completion of the TWP System and before CAIS has spent $200,000 for
     R&D pursuant to section 4 above, Inline shall be entitled to a non-
     exclusive license to any new intellectual property obtained or created by
     CAIS or any CAIS Affiliate during the period of this Agreement occurring
     prior to such termination that relates to communication internal to a
     structure over twisted pair wires at frequencies above the common
     voiceband.

     New intellectual property created or obtained by David D. Goodman or his
     Inline personnel during the Consulting Period and not relating to
     communication over twisted pair wires shall be made known to CAIS.  If CAIS
     is interested in exploiting such new rights, CAIS may either incorporate
     such rights into this Agreement by scheduling them in into Appendix I or
     CAIS shall be entitled with a paid-up four (4) month option following
     written notice to CAIS of the existence of such new intellectual property
     to either negotiate a new and more favorable (to CAIS) agreement with
     respect to such new rights or in the absence thereof, to incorporate same
     into this Agreement as aforesaid.

11.  JOINT OWNERSHIP OF PATENT RIGHTS
     --------------------------------

     After CAIS has paid Inline SEVEN HUNDRED FIFTY THOUSAND DOLLARS $750,000 in
     compensation (and for such purposes all sums paid to Inline hereunder by
     CAIS or a CAIS Affiliate shall be aggregated, including without limitation
     the initial option payment, the purchase price for the option, the monthly
     fees of $7,500, $8,500 and $10,000, respectively and all royalties payable
     to Inline hereunder) under this agreement, fifty percent (50%) of the
     ownership of Inline's interest in all of the properties set forth on
     Appendix I, as same may be supplemented from time to time in accordance
   

                                       19
<PAGE>
 
     with the provisions of this Agreement, shall be assigned to CAIS.  All
     other considerations under this Agreement shall remain the same.

     In the event this Agreement is terminated subsequent to CAIS's acquisition
     of the right to fifty percent (50%) of the ownership of Inline's interest
     in all of the properties set forth on Appendix I:

          a) CAIS or a CAIS affiliate can use any of the TWP patent rights
          itself, or it can trade rights to use the patented internal
          distribution technology for distribution of signals to end users.  The
          consideration CAIS receives in return for such a trade must include
          the right and obligation to provide substantial information services
          to these end-users, either directly or through a third party.  CAIS
          shall compensate Inline, for the resulting subscription fees,
          according to the schedules that applied prior to termination, subject
          to the Most Favored Nation protection as provided in section 4 above.

          b) Inline can license other companies to use the technology.  It must
          pay CAIS 50% of all royalties collected in this manner.  If Inline
          uses the technology itself, it shall pay CAIS royalties according to
          the rates set forth in the Royalty Chart schedules set forth in
          Appendix II.

12.  ENFORCEMENT OF INTELLECTUAL PROPERTY RIGHTS
     -------------------------------------------

     CAIS shall have the right, but not the obligation, to undertake any demand,
     suit or action against infringers of the intellectual property, licensed
     hereunder.  In the event that CAIS proceeds with an enforcement suit or
     action, Inline shall cooperate with CAIS in prosecuting the suit or action
     and shall make its personnel available for testifying as witnesses at trial
     or depositions, for assisting in the drafting of litigation documents
     including interrogatories and answers to interrogatories and document
     requests, and for such other assistance as may be required to reasonably
     prosecute the litigation.  In the event that CAIS obtains any judgment as a
     result of litigation conducted by CAIS against third parties, Inline shall
     be entitled to partake of any award after CAIS has been reimbursed for
     expenses.  In addition, Inline shall be able to receive from such award
     reimbursement of the reasonable costs incurred by Inline in 

                                       20
<PAGE>
 
     providing expert witnesses and assistance in the litigation required of
     Inline hereinabove. In the event that the award is calculated on the basis
     of a reasonable royalty, Inline shall receive fifty percent (50%) of an
     established or reasonable royalty. If the award is calculated on the basis
     of lost profits, Inline shall receive a percentage comparable to the
     percentage which Inline would have received based upon whether the claim
     was for services or products and assuming that if the claim were for
     products that such products were manufactured by CAIS. In the event CAIS
     declines to proceed with an enforcement suit or action by reason of the
     determination that pursuit thereof is not economically feasible, Inline
     shall be free to pursue on its own behalf with the enforcement action. In
     such event, Inline shall be entitled to recover first from any damages
     awarded its costs and expenses relating to such enforcement action,
     together with interest thereon at the rate of eight percent (8%) per annum
     from the date advanced until collected. Thereafter, CAIS shall be entitled
     to partake of the award.

     Should CAIS find patent protection desirable on new developments by David
     D. Goodman or other Inline personnel covered by this Agreement, Inline
     shall file appropriate patent application and will prosecute such
     application at Inline's expense.  During prosecution, Inline shall consult
     with attorneys for CAIS regarding the scope and sufficiency of protection.
     Inline shall keep all patents in force, for example, by the timely payment
     of maintenance or renewal fees.  Should Inline decide not to keep a patent
     or application in force, they must inform CAIS at least thirty (30) days in
     advance of the date.  If CAIS decides to assume responsibility, Inline will
     assign the property to CAIS which will be responsible for the costs of
     assignment and future costs of the property.  Should Inline decide not to
     file a patent application, they shall inform CAIS.  If CAIS wishes to
     assume the responsibility and costs of such application, Inline will have
     the inventor(s) assign the rights to CAIS.

13.  CONFIDENTIALITY
     ---------------

     Each party shall treat as confidential all new developments by either party
     in intellectual property that fall within the bounds of the technology
     being licensed hereunder.  This obligation as to confidentiality shall not
     apply to any information which:

                                       21
<PAGE>
 
     (a)  was in the public domain at the time of its disclosure hereunder, or

     (b)  subsequently becomes part of the public domain through no fault of
          either party, as of the date of its becoming part of the public
          domain, or

     (c)  was received from a third party, provided that the information was not
          obtained by the third party directly or indirectly from CAIS or Inline
          under an obligation of confidentiality.

14.  INSURANCE
     ---------

     CAIS shall purchase $5,000,000 of liability insurance for Inline for each
     of the first two years following production of the TWP System.  Such
     payments shall be deducted from royalties.  Any premiums paid by CAIS shall
     be credited against the minimum royalties CAIS is obligated to pay under
     this Agreement.

15.  WARRANTIES
     ----------

     Inline hereby warrants that it is the rightful owner of the intellectual
     property under which this license is granted.  Inline also warrants that to
     its knowledge all of the patents presently set forth in Appendix I are
     valid.  Inline further warrants that to the best of its knowledge, after
     due inquiry, exercise by CAIS of its rights granted under this Agreement
     will not result in the infringement by CAIS or its affiliates on the rights
     of any other patent holders. CAIS acknowledges that Inline has disclosed to
     CAIS the existence of a patent held by Xantech Corporation related to
     infrared communications, and that a limited number of alternative
     implementations of the TWP Technology could result in an infringement on
     such Xantech patent, but that there exist many other alternative
     implementations of the TWP Technology that Inline, to the best of its
     knowledge, believes would not result in an infringement on such Xantech
     patent.

16.  INDEMNIFICATION
     ---------------

     Inline agrees to indemnify and hold CAIS harmless against any and all
     claims, demands, suits, actions, proceedings, costs, damages, expenses or
     other disputes, including 

                                       22
<PAGE>
 
     damages under any antitrust claim or action, which relate, directly or
     indirectly to, the failure of Inline to perform any of its obligations
     hereunder, or the breach of any representation or warranty made herein.

     CAIS agrees to indemnify and hold Inline harmless against any and all
     claims, demands, suits, actions, proceedings, costs, damages, expenses, or
     other disputes, including damages under any antitrust claim or action,
     which relate, directly or indirectly, to the failure of CAIS to perform any
     of its obligations hereunder, the breach of any representation or warranty
     made by CAIS herein, or in connection with the manufacture, use and sale of
     products, subject to the Limitation Exceptions set forth above.

     Notwithstanding the foregoing, the parties expressly recognize and agree
     that neither CAIS nor Inline shall be deemed to have indemnified the other
     against any anti-trust action or claim arising by reason of the grant of
     exclusive rights by Inline to CAIS hereunder, or exercise by CAIS of such
     exclusive rights.

17.  HEADINGS
     --------

     The headings or titles of this Agreement are inserted merely for
     convenience and identification and shall not be used or relied upon in
     connection with the construction or interpretation of this Agreement.

18.  SURVIVAL AND SEPARABILITY
     -------------------------

     The parties agree that it is the intention of neither party to violate any
     public policy, statutory or common laws, or governmental or supranational
     regulations; that if any sentence, paragraph, clause or combination of the
     same is or becomes in violation of any applicable law or regulation, or is
     enforceable or void for any reason, such sentence, paragraph, clause or
     combination shall be inoperative and the remainder of the Agreement shall
     remain binding upon the parties.


19.  ASSIGNMENT
     ----------

     CAIS shall have the right to assign its rights and/or obligations under
     this Agreement upon receiving the written consent of Inline, which consent
     shall not be unreasonably 

                                       23
<PAGE>
 
     withheld. In the event that CAIS determines to assign a selected number of
     its obligations under this Agreement, the Assignment shall be effective
     only if the successor-in-interest shall agree in writing with Inline to
     assume the selected obligations.

     It is understood that Inline's performance under this Agreement is
     considered to be in the nature of a personal service contract and is
     therefor not assignable.  For example, assistance by Inline personnel and
     specifically David D. Goodman in developing the technology is considered
     essential to commercialization.  Inline and David D. Goodman warrant and
     represent that David D. Goodman currently controls Inline Connection
     Corporation and that David D. Goodman shall continue to remain in control
     of Inline Connection Corporation.  Notwithstanding the foregoing, Inline
     shall be entitled to convert from a corporation to a limited liability
     company or other similar entity, which conversion shall be expressly
     permitted hereunder, or to transfer its assets to a limited liability
     company or other similar entity, so long as any such converted entity shall
     remain in the control of David D. Goodman.

20.  CONSTRUCTION AND JURISDICTION
     -----------------------------

     This Agreement shall be construed, interpreted and applied in accordance
     with the laws of the District of Columbia applying to contracts fully
     executed and performed in the City of Washington, District of Columbia.  In
     the event of any dispute in connection with this Agreement or the
     provisions thereof, the parties shall submit to arbitration before the
     American Arbitration Association at their offices in Washington, D.C.  The
     decision of the Association shall be a final decision binding on the
     parties without the right of appeal.

21.  WAIVER
     ------

     The waiver of any breach of this Agreement by any party thereto shall in no
     event constitute a waiver as to any future breach, whether similar thereto
     or dissimilar in nature.

22.  MERGER
     ------

     This instrument constitutes the complete Licensing Agreement between the
     parties and there are no understandings, 

                                       24
<PAGE>
 
     representations, or warranties of any kind except as expressly provided
     herein and as may be provided in subsequent agreements.

23.  AUDIT RIGHTS
     ------------  

     Inline and Goodman, and CAIS and any CAIS Affiliate shall be entitled to
     audit (either itself or through the services of an accredited third party
     auditing firm that has agreed to be bound by appropriate confidentiality
     restrictions) the financial records of the other party periodically during
     the term (but no more frequently than twice a year) in order to confirm
     compliance by such other party of its obligations under this Agreement.
     The parties shall respectively reasonably cooperate with any such audit.
     Any such audit shall be conducted during normal business hours within the
     Washington, D.C., metropolitan area.  The parties agree to promptly correct
     any deficiencies or overages paid hereunder disclosed by such audit.  The
     parties further agree that should any such audit disclose deficiencies in
     amounts paid by the audited party to the auditing party that are greater
     than 50% of the amount that should have been paid, then in such case the
     audited party shall reimburse the auditing party for the reasonable costs
     of such audit.

24.  CONFIDENTIALITY
     ---------------

     Inline and CAIS both agree to use commercially reasonable efforts to
     maintain information or materials received from the other party on a
     confidential basis which is requested by the providing party to be so
     maintained.  Nothing contained herein shall be deemed to require a
     receiving party from disclosing by reason of court or other judicial order
     any information or materials received from the other party; however, both
     parties shall at the sole cost and expense of the requesting party
     reasonably cooperate with

                                       25
<PAGE>
 
     any lawful protests instituted by the requesting party to contest the
     requirement that any such confidential information be disclosed.

     Inline Connection Corporation

     By:       /s/ David D. Goodman
             ----------------------  
               David D. Goodman

     Title:   President


        David D. Goodman
     --------------------------      
     David D. Goodman, in his individual capacity


     CAIS, Inc.

     By:       /s/ Ulysses G. Auger, II
             --------------------------  


     Title:     President
             --------------   

                                       26
<PAGE>
 
                                 APPENDIX I

                                 Inline's Twisted Pair Patents
                                 and
                                 Patent Applications


1)   US Patent No 5,010,399, "Video Transmission and Control System Utilizing
     Internal Telephone Lines," David D Goodman and Robert H Domnitz, filed
     7/14/89, 30 claims issued 4/23/91 and assigned to Inline Connection
     Corporation.  Other patents and applications based on the identical
     disclosure:

          A continuation application, filed with the US PTO, currently active.
          Eighty-two claims, filed in June, 1996,  currently under
          consideration.

          Canadian patent No 2020841,  granted July, 1994.  Fourteen claims.

          A South Korean application, submitted in December, 1990.

          A European application, submitted in June, 1990.  Fourteen claims
          recently approved by the European PTO.  Includes Rights to obtain
          claims in Great Britain, France, and Germany.


2)   Three applications submitted to the US PTO on December 5, 1991:

          "RF Broadcast System Utilizing Internal Telephone Lines"

          "Cable Television Distribution and Communication System Utilizing
          Internal Telephone Lines"

          "Two-way RF Communication at Points of Convergence of Wire Pairs from
          Separate Internal Telephone Networks"


3)   An application submitted to the US PTO July 12, 1996, entitled, "A Digital
     Communication System for Apartment 

                                       27
<PAGE>
 
     Buildings and Similar Structures Using Existing Telephone Wires."

                                       28
<PAGE>
 
                                  Appendix II

 
 
                                               Column                        D            E           F            G           H
                                                                         Section       Section    Section       Section    Section
Royalty Percentages of Annual Commissionable Revenue                       7.1           7.2        7.3         7.4 3rd      7.5 
         Years One and Two                                               Equipment   Information  Telephone      Party       ADSL
                                                                           Sales      Services     Services    Royalties   Royalties

                                                                             %            %           %            %           %
                                                                                                               
         From                     $1  To         *                       0.00%        5.50%       3.00%       50.00%      70.00%  
                                                                                                                                  
         From                      *  and up                             3.00%        5.50%       3.00%       50.00%      70.00%  
                                                                                                                                  
         Year Three and Each Year Thereafter                                                                                      
                                                                                                                                  
         From                     $1  To         *                       4.50%        5.50%       2.75%       50.00%      70.00%  
                                                                                                                                  
         From                      *  To         *                       4.50%        5.00%       2.50%       50.00%      70.00%  
                                                                                                                                  
         From                      *  To         *                       4.00%        4.75%       2.38%       45.00%      70.00%  
                                                                                                                                  
         From                      *  To         *                       4.00%        4.50%       2.25%       40.00%      70.00%  
                                                                                                                                  
         From                      *  To         *                       4.00%        4.00%       2.00%       40.00%      70.00%  
                                                                                                                                  
                                   *  To         *                       4.00%        3.50%       1.75%       40.00%      60.00%  
                                                                                                                                  
                                   *  And up                             3.00%        3.00%       1.50%       40.00%      60.00%  
 


*    Confidential Treatment Requested. The redacted material has been separately
     filed with the Commission.

<PAGE>
 
                              LICENSING AGREEMENT
                     TERK TECHNOLOGIES - INLINE CONNECTION
                     -------------------------------------

Agreement dated as of December 17, 1994 between Inline Connection Corporation
(Inline) and Terk Technologies, Inc. (Terk).  For purposes of interpretation and
for all other legal purposes, Inline and Terk shall be considered to be joint
and equal authors of this document.

As part of this agreement, Inline agrees to grant Terk an exclusive license,
under the intellectual property defined below, to build, use, and sell
technology, as defined below, in the field of use, as defined below.

Terk shall pay Inline a $5,000 option fee upon execution of this document.  The
contract shall then become effective if, at any time within the succeeding two
months:

     1)   Terk indicates to Inline in writing that Terk elects to enter into 
          this agreement, and
     2)   Terk pays Inline a signing fee of $20,000.  The $20,000 and $5,000
          payments shall be credited towards royalties.

Terk may extend the period which it may elect to satisfy the above paragraphs
(1) and (2) and have this Agreement become effective, if within 60 days from the
date hereof it pays Inline $5,000.00, which amount shall be credited against the
$20,000 to be paid pursuant to sub paragraph (2).

TECHNOLOGY DEFINITION:
Products that transmit one or more signals onto twisted pair wires at
frequencies above 3Khz, and products that receive one or more signals at
frequencies above 3Khz, by connection to twisted pair wires.

APPLICABLE PATENTS:
The license includes all rights to the technology, in the field of use, given in
the following patents:

     US Patent Number 5,010,399, filed July 16, 1989, granted April 23, 1991 and
     assigned to Inline Connection Corp.

     US Patent Application # (serial number provided in confidence) a
     continuation to US Patent No. 5,010,399, pending.

     European Patent Application # (serial number provided in confidence),
     identical to the application that generated US 5,010,399 and having the
     same priority date, pending.

     Canadian Patent Number 2,020,841, granted on June 15, 1994 and assigned to
     Inline Connection Corp.
<PAGE>
 
     South Korean Patent application (serial number provided in confidence),
     identical to the application that generated US 5,010,399, pending.

     Three pending US patent applications filed December 5, 1991 by David D.
     Goodman, et al, and assigned to Inline Connection, (serial numbers provided
     in confidence.)

     Any other patent application filed by Inline Connection Corporation or
     David D. Goodman that teaches new elements and concepts within the bounds
     of the above technology definition.

The license also includes the right to sub-license any and all rights to the
technology, subject to limitations set forth herein.

FIELD OF USE:

The field of use is strictly confined to residential settings and bars,
restaurants, coffee shops, and other business establishments earning at least
                               ----------------------------------------------
90% of their revenues from the sale of food and beverages consumed on premises.
------------------------------------------------------------------------------ 

     "Purchaser (or licensor) agrees not to use this product in non-residential
     sites including, specifically but not exclusively, hotels, hospitals,
     schools, all commercial sites (other than those listed in the first
                                   -------------------------------------
     paragraph of this "Field of Use" section), and office buildings. Also, use
     -----------------------------------------                                 
     of the technology to transmit signals from the "telephone wiring closet"
     commonly found on the ground floor of apartment buildings, or a similar
     point of convergence of wires leading to terminations in different
     apartment units, is specifically prohibited.  The only use permitted in
     apartment buildings is the transmission of signals internal to a
     residential unit.  The purchaser (or licensor) agrees to affix the
     following label on all products: "For Residential Use Only".  This
     paragraph shall be placed in all agreements to resell or sub-license this
     product.  This paragraph is the only agreement on its subject and shall
     supersede all contradictory agreements.  It may be enforced by Inline
     Connection Corporation."

Terk agrees to adhere to the above paragraph and to place this language in all
sales contracts or other agreements relating to the products.  (Terk shall be
released from any claims for any violation of the terms of this section if this
paragraph was included in the contract to license or sell the violating
products.)

Inline shall have the right to manufacture products for its own uses in
transmitting from point to point within an apartment unit in connection with the
sale or installation of equipment for servicing multiple dwelling units in the
same building.

The field of use is clarified further in the following section.

                                       2
<PAGE>
 
OUTSIDE/INSIDE TELEPHONE WIRING:

Telephone companies (telcos) are currently transmitting video and other high
data rage signals over the twisted pair wires that define the "subscriber loop"
reaching from the telcos' central switching office to their subscribers.
Devices that fall within the bounds of the "technology definition" can also be
used to transmit signals to the subscribers from some point on the subscriber
loop located between the central switching office and the residence.  One
version of this technology is known as ADSL (Asymmetrical Digital Subscriber
Line).

At the subscriber's residence, these types of signals can flow from the outside
wiring to the inside wiring, and in the opposite direction.  Inline retains the
specific and exclusive right, under its patents, to build, sell, and use,
electronic receivers that connect to internal wiring to receive signals that
were last transmitted (i.e. processed electronically) at a pont outside the
residence and removed from the subscriber's property.  Inline retains the same
rights for signals that are transmitted inside the residence and received at an
outside point that is removed from the subscriber's property.

Communication of any signal between two devices that are located at points
inside or immediately adjacent to the residence and embody principles that fall
within the "technology definition" shall be within the scope of the License
granted and subject to the terms of this agreement.

ROYALTY RATE:

For the purposes of determining royalties, a video service provider shall be
defined as a company which directly or through an affiliate provides video
signals or telephone service to more that 50,000 subscribers.
                                          ------             

The following rates shall apply for all products that fit the technology
definition except "Integral Products," as it is defined in the next section:

     4% for products manufactured by Terk, including OEM and private label
     sales, and sold to companies other than a video service provider,

     6.5% for products manufactured by Terk, including OEM and private label
     sales, and sold to a video service provider,

     50% of sub-licensing fees obtained from video service providers or from
     products that are sold directly from factories to a video service provider,

     50% of sub-licensing fees obtained from all other sources.

In any country not protected by a patent or patent application, the royalty rate
shall be reduced in respect of goods manufactured or sold for use in such
country should it become clear that competitors have entered the market in such
country.  The reduction shall be negotiated by the parties in good faith upon a
determination that a competitor has entered the market and a determination of
the anticipated effect that the competitor has in that market.  The royalty rate

                                       3
<PAGE>
 
may be reduced further based on the impact that the competitor has on the
ability of Terk or a sub-licensee to compete in that market.

INTEGRAL PRODUCTS:

The following products are likely candidates to have the subject technology
included as part of their circuitry and inside their enclosures:

     TV devices
     VCRs
     Laser Disk Players
     Video Games
     Video Cameras
     Cable Convertors and other Video Set-Top Boxes
     Satellite Convertors
     Cassette Decks
     CD Players
     FM Tuners
     Audio Amplifiers
     Lap-Top Computers
     Personal Computers

The royalty rates for the integral products listed above are:

     4% for products manufactured by Terk including OEM and private label sales,
     and sold to companies other than a video service provider,

     6.5% for products manufactured by Terk including OEM and private label
     sales, and sold to video service providers,

     60% of the royalties from the sale of televisions and 55% of the royalties
     from any other source.

In any country not protected by a patent or patent application, the royalty rate
shall be reduced in respect of goods manufactured or sold for use in such
country should it become clear that competitors have entered the market in such
country.  The reduction shall be negotiated by the parties upon a determination
that a competitor has entered the market and a determination of the anticipated
effect that the competitor has in that market.  The royalty rate may be reduced
further based on the impact that the competitor has on the ability of Terk or a
sub-licensee to compete in that market.

MINIMUM ANNUAL ROYALTIES:

Terk is required to pay Inline the following minimum royalties:

     -    $25,000 payable no later than December 31, 1995
     -    $25,000 payable no later than December 31, 1996

                                       4
<PAGE>
 
     -    $50,000 in the succeeding 12 month period,
     -    $100,000 within each of the next 3 succeeding 12 month periods,
     -    $150,000 within each of the succeeding 12 month periods.

Royalties shall be computed on the wholesale prices of the devices sold by Terk
utilizing the technology licensed under this Agreement but excluding freight,
insurance, returns, discounts, allowances and similar items.  In the case of
Integral Products, royalties shall be based on the wholesale price of the
individual component utilizing the technology licensed under this Agreement and
making up a part of the Integral Product, except in the case of Integral
Products manufactured by Terk royalties will be based on value added.

BEST EFFORTS:
------------ 

Terk agrees to use its best efforts to market and sell Terk's products
----------------------------------------------------------------------
incorporating the technology licensed to Terk pursuant to this agreement.
------------------------------------------------------------------------ 

ENFORCEMENT OF INTELLECTUAL PROPERTY RIGHTS:

Terk shall have the right, but not the obligation, to undertake any demand, suit
or action against infringers of the intellectual property, as defined herein.
In the event that Terk proceeds with an enforcement suit or action, Inline shall
cooperate with Terk in prosecuting the litigation and shall make its personnel
available for testifying as witnesses at trial or depositions, for assisting in
the drafting of litigation documents including interrogatories and answers to
interrogatories and document requests, and for such other assistance as may be
required to reasonably prosecute the litigation.  In the event that Terk obtains
any judgment as a result of litigation conducted by Terk against third parties,
Inline shall be entitled to partake of any award after Terk has been reimbursed
for expenses.  In the event that the award is calculated on the basis of a
reasonable royalty, Inline shall receive 50% of an established or reasonable
royalty.  If the award is calculated on the basis of lost profits, Inline shall
receive a percentage (4%, 6.5%) as set forth above for products manufactured by
Terk.

EXCHANGE OF INTELLECTUAL PROPERTY RIGHTS:

Any intellectual property rights, including trade secret and proprietary know-
how, that may be developed by Inline that fall within the bounds of the
"Technology Definition," shall be licensed under this Agreement and covered by
all the terms of this agreement, including specifically, but not exclusively,
the "Field of Use" clause.  These intellectual property rights shall revert to
Inline upon expiration of the term of this agreement.

Should Terk develop intellectual property rights that fall within the
"Technology Definition," Terk will grant a non-exclusive license to such rights,
free of charge, to Inline.

Each given party shall keep the other party informed as to all new developments
by the given party in intellectual property that fall within the bounds of the
"Technology Definition".  In addition, the parties shall consult with one
another about the advisability of filing for patent protection for any new
intellectual property that may be developed by one or both of the parties within
the bounds of the "Technology Definition."  Should Terk find patent protection
desirable, Inline shall file appropriate patent application and will prosecute
such applications at Inline's 

                                       5
<PAGE>
 
expense. During prosecution, Inline shall consult with Terk attorneys regarding
the scope and sufficiency of protection. Inline shall keep all patents in force,
for example, by the timely payment of maintenance or renewal fees.

CONFIDENTIALITY:

Subject to mutual disclosure as discussed above, each party shall treat as
confidential all new developments by either party in intellectual property that
fall within the bounds of the "Technology Definition".  This obligation as to
confidentiality shall not apply to any information which:

     (a) was in the public domain at the time of its disclosure hereunder, or

     (b) subsequently becomes part of the public domain through no fault of
either party, as of the date of its becoming part of the public domain, or

     (c) was received from a third party, provided that the information was not
obtained by the third party directly or indirectly from Terk or Inline under an
obligation of confidentiality.

CONSULTATION AND COMMERCIAL DEVELOPMENT:

Inline shall provide to Terk whatever assistance is reasonably deemed necessary
                                                    ----------                 
by Terk to enable Terk to manufacture and market technology, as defined above.

SPECIAL FOREIGN LIMITATIONS:

Terks licensing rights are worldwide, except that there shall be no sales by
Terk in Germany or Austria, and no sales or sub-license to German-owned or
Austrian-owned companies.

MARKING OF PRODUCTS:

All products shall be marked: "Manufactured and sold under license from Inline
Connection Corporation."

TERM:

The term of the agreement shall extend for the life of all patents that cover
technology that meet the specifications of "technology definition."  Terk may
not suppress sale of the product in return for compensation from a third party.
Such action would terminate the agreement.  Terk may terminate this Agreement at
any time by giving Inline 30 days' prior written notice of such termination.

INSURANCE:

Terk shall purchase $5,000,000 amount liability insurance for Inline for each of
the first two years.  Such payments shall be deducted from royalties.  Inline
may elect to decline this insurance, and keep the royalties.  Any premiums paid
by Terk shall be credited against the minimum royalties Terk is obligated to pay
under this Agreement.

WARRANTIES:

Inline hereby warrants that it is the rightful owner of the intellectual
property under which this license is granted.  Inline also warrants that to its
knowledge all patents set forth above under "applicable patents" are valid.
Inline further warrants that it knows of no patents owned by third 

                                       6
<PAGE>
 
parties which would be infringed by Terk in exercising the rights granted under
the intellectual property as defined herein.

INDEMNIFICATION:

Inline agrees to indemnify or hold Terk harmless against any and all claims,
                                                             ---            
demands, suits, actions, proceeding, costs, damages, expenses, or other
disputes, including damages under any antitrust claim or action, with relate,
directly or indirectly, from the rights and licenses granted hereunder
including, but not limited, to, the failure of Inline to perform any of its
obligations hereunder, or the breach of any representation or warranty made
herein.

Terk agrees to indemnify or hold Inline harmless against any and all claims,
                                                             ---            
demands, suits, actions, proceeding, costs, damages, expenses, or other
disputes, including damages under any antitrust claim or action, which relate,
directly or indirectly, to the failure of Terk to perform any of its obligations
hereunder, the breach of any representation or warranty made herein, or in
connection with the manufacture, use and sale of products.

HEADINGS:

The headings or titles of this Agreement are inserted merely for convenience and
identification and shall not be used or relied upon in connection with the
construction or interpretation of this Agreement.

SURVIVAL AND SEPARABILITY:

The parties agree that it is the intention of neither party to violate any
public policy, statutory or common laws, or governmental or supranational
regulations; that if any sentence, paragraph, clause or combination of the same
is or becomes in violation of any applicable law or regulation, or is
enforceable or void for any reason, such sentence, paragraph, clause or
combination shall be inoperative and the remainder of the Agreement shall remain
binding upon the parties.

ASSIGNMENT:

Terk shall have the right to assign its rights and/or obligations under this
Agreement upon receiving the written consent of Inline, which consent shall not
be unreasonably withheld.  In the event that Terk determines to assign a
selected number of its obligations under this Agreement, the Assignment shall be
effective only if the successor in interest shall agree in writing with Inline
to assume the selected obligations.

It is understood that Inline's performance under this contract is considered to
be in the nature of a personal service contract.  For example, assistance by
Inline personnel in developing the technology is considered essential to
commercialization.

CONSTRUCTION AND JURISDICTION:

This Agreement shall be construed, interpreted and applied in accordance with
the laws of the state of New York applying to contracts fully executed and
performed in New York.  In the event of any dispute in connection with this
Agreement or the provisions thereof, the parties shall submit to arbitration
before the American Arbitration Association at their offices in New York, 

                                       7
<PAGE>
 
New York. The decision of the Association shall be a final decision binding on
the parties without the right of appeal.

WAIVER:

The waiver of any breach of this Agreement by any party hereto shall in no event
constitute a waiver as to any future breach, whether similar thereto or
dissimilar in nature.

MERGER:

This instrument constitutes the complete Licensing Agreement between the parties
and there are no understandings, representations, or warranties of any kind
except as expressly provided herein and as may be provided in subsequent
agreements.

TERK TECHNOLOGIES CORP.             INLINE CONNECTION CORPORATION

By:     /s/ Neil Terk                By:     /s/ David Goodman
      ----------------------              --------------------------
      Neil Terk, President                David Goodman, President


Dated: 4/18/95                       Dated:__________________________
      ----------------------

                                       8


CAIS, INC. 1232 22nd Street, N.W. Washington, D.C. 20037 Tel. (202) 463-8500 Fax (202) 463-7190 February 28, 1997 Mr. David D. Goodman Inline Connection Corporation 730 N. Danville Street Arlington, VA 22201 Dear David: This will confirm our agreement regarding an extension of the Option Period as provided for in the November 5, 1996 Agreement for Cooperative Use of Communication Patents among Inline Connection Corporation, you in your individual capacity, and CAIS, Inc. (the "Agreement"). For good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Agreement is hereby amended and modified as follows: 1. The Option Period as provided in Section 1.1 of the Agreement shall be extended to five (5) months from the date the Agreement was executed (i.e., the Option Period shall expire on April 5, 1997) unless the Option is sooner exercised or terminated in accordance with the provisions of the Agreement. 2. Section 1.4 of the Agreement shall be modified to provide that in addition to payment to Inline of $7500 per month during the first three months of the Option Period, in return for your services, due 15, 45, and 75 days after execution of the Agreement, Inline shall be paid $7500 during the fifth month of the Option Period in return for your continued services, such payment to be due 135 days after execution of the Agreement. This also will confirm that CAIS has paid to Inline during the fourth month of the Option Period a $7500 advance against the $50,000 payment to be made to Inline upon CAIS's exercise of its Option, as provided in Section 1.6 of the Agreement, such advance to be refunded by Inline to CAIS in the event CAIS does not exercise its Option. All other terms and conditions of the Agreement remain in full force and effect. If the above reflects your understanding and meets with your approval, please so <PAGE> indicate by countersigning below on behalf, respectively, of Inline and in your individual capacity. Sincerely, CAIS, Inc. By: /s/ Ulysses G. Auger, II ------------------------------------- Ulysses G. Auger, II, President Agreed to: Inline Connection Corporation By: /s/ David D. Goodman ---------------------------------- David D. Goodman, President 2/28/97 ------- Date Agreed to: /s/ David D. Goodman --------------------------------- David G. Goodman, in his individual capacity 2/28/97 ------- Date 2
CAIS, INC. 1232 22nd Street, N.W. Washington, D.C. 20037 Tel. (202) 463-8500 Fax (202) 463-7190 April 4, 1997 Mr. David D. Goodman Inline Connection Corporation 730 N. Danville Street Arlington, VA 22201 Dear David: CAIS, Inc. hereby exercises its Option Pursuant to Section 1.6 of the November 5, 1996 Agreement for Cooperative Use of Communication Patents among Inline Connection Corporation, you in your individual capacity, and CAIS, Inc. , as amended by letter agreement dated February 28, 1997 (the "Agreement"). Enclosed is a check for $22,500 payable to Inline Connection Corporation. As we agreed today, an additional $20,000, which represents the balance of the $50,000 Option exercise payment as provided in Section 1.6 of the Agreement (after credit for the $7,500 advance previously paid to Inline, as set forth in paragraph 2 of the February 28 amendment) will be paid to Inline by no later than May 4, 1997. Please indicate your consent to this payment arrangement by signing below individually and on behalf of Inline. We appreciate your cooperation, and look forward to a continued mutually successful relationship with you and Inline. Sincerely, CAIS, Inc. By: /s/ Ulysses G. Auger, II --------------------------- Ulysses G. Auger, II, President encl. Agreed to: Agreed to: Inline Connection Corporation By: /s/ David D. Goodman David D. Goodman ---------------------- ----------------- David D. Goodman, President David D. Goodman, in his individual capacity 4/4/97 4/4/97 ------------------- ------------------ Date Date
CAIS, INC. 1232 22nd Street, N.W. Washington, D.C. 20037 Tel. (202) 463-8500 Fax (202) 463-7190 August 1, 1997 Mr. David D. Goodman Inline Connection Corporation 730 N. Danville Street Arlington, VA 22201 Dear David: This will confirm our agreement regarding certain modifications to the November 5, 1996 Agreement for Cooperative Use of Communication Patents among Inline Connection Corporation, you in your individual capacity, and CAIS, Inc. (the "Agreement"). For good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Agreement is hereby amended and modified as follows: 1. Section 12 of the Agreement currently provides in pertinent part that "Should CAIS find patent protection desirable on new developments by David D. Goodman or other Inline personnel covered by this Agreement, Inline shall file appropriate patent application and will prosecute such application at Inline's expense." Inline has requested, and CAIS has agreed, that because of the recent increase in patent related expenses and the expectation that such increased expenses will continue in the near term, that this arrangement be modified as follows: a. Upon request by Inline, CAIS shall advance funds to Inline for the purpose of Inline's payment of expenses related to patent applications and prosecutions contemplated by the provisions of Section 12 of the Agreement (the "Patent Expenses") provided that: (i) Inline has received CAIS's approval and consent prior to authorizing and incurring such Patent Expenses; and (ii) Inline has complied with its obligation under Section 12 of the Agreement to consult with attorneys for CAIS regarding the scope and sufficiency of patent protection for the TWP technology covered by the Agreement. 1 <PAGE> b. Such advances by CAIS shall accrue interest at a rate of 8% per annum from the date they are advanced to Inline until repaid. If not repaid by Inline sooner, such advances, including accrued interest, shall be recoverable by CAIS from Inline as a partial offset against royalty payments otherwise due from CAIS to Inline pursuant to Sections 7 and/or 8 of the Agreement. For purposes of this provision, partial offset shall mean that CAIS shall be entitled to hold back and apply to such recovery fifty percent (50%) of the royalties otherwise due from CAIS to Inline. c. If and to the extent the Agreement is terminated for any reason prior to the full offset of such advances and accrued interest by royalties otherwise becoming due from CAIS to Inline, then the balance, if any, of such advances including accrued interest, shall be due and payable from Inline to CAIS not later than 90 days from the effective date of such termination. 2. During the term of the Agreement, and for a period of one year thereafter, neither Inline nor CAIS shall attempt to hire away the other's employees or provide the other's employees with any form of compensation or inducement that was not approved in advance by the employing entity. All other terms and conditions of the Agreement remain in full force and effect. If the above reflects your understanding and meets with your approval, please so indicate by countersigning below on behalf, respectively, of Inline and in your individual capacity. Sincerely, CAIS, Inc. By: /s/ Ulysses G. Auger, II ----------------------------------- Ulysses G. Auger, II, President Agreed to: Inline Connection Corporation By: /s/ David D. Goodman -------------------------------- David D. Goodman, President 8/11/97 --------------------- Date Agreed to: 2 <PAGE> /s/ David D. Goodman -------------------------------- David D. Goodman, in his individual capacity 8/11/97 ------------------------ Date 3
CAIS, INC. 1232 22nd Street, N.W. Washington, D.C. 20037 Tel. (202) 463-8500 Fax (202) 463-7190 October 21, 1997 Mr. David D. Goodman Inline Connection Corporation 730 N. Danville Street Arlington, VA 22201 Dear David: This will confirm our agreement regarding certain modifications to the November 5, 1996 Agreement for Cooperative Use of Communication Patents among Inline Connection Corporation, you in your individual capacity, and CAIS, Inc. (the "Agreement"). For good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the second sentence of the sixth paragraph of Section 4 of the Agreement is hereby revised to provide as follows: "CAIS hereby agrees to commit to spend up to $200,000 from the date of this Agreement through a date nine (9) months following the date of the exercise of the Option." All other terms and conditions of the Agreement remain in full force and effect. If the above reflects your understanding and meets with your approval, please so indicate by countersigning below on behalf, respectively, of Inline and in your individual capacity. Sincerely, CAIS, Inc. By: /s/ Ulysses G. Auger, II ---------------------------------------- Ulysses G. Auger, II, President Agreed to: Inline Connection Corporation By: /s/ David D. Goodman -------------------------------- David D. Goodman, President 10/21/97 ----------------------- Date Agreed to: /s/ David D. Goodman --------------------------------- David D. Goodman, in his individual capacity 10/21/97 ---------------------- Date
Inline Connection Corporation 730 N. Danville Street Arlington, VA 22201 January 6, 1999 Mr. Ulysses G. Auger, II CAIS, Inc. 1232 22nd Street, N.W. Washington, D.C. 20037 Re: PCT Serial No. PCT/US97/12045 Dear Ulysses: Consistent with our recent discussions, this will confirm that pursuant to the second paragraph of Section 12 of the November 5, 1996 Agreement for Cooperative Use of Communication Patents among Inline Connection Corporation, David Goodman in his individual capacity, and CAIS, Inc. (the "Agreement"), Inline hereby notifies CAIS that Inline has determined that, other than with respect to a national application for the country of Israel (which application Inline shall prosecute and maintain at Inline's expense), Inline will assign the referenced PCT international application to CAIS, with CAIS assuming responsibility for the costs of the assignment and for future costs of prosecuting and maintaining this property. CAIS agrees to provide Inline with copies of all substantive correspondence with any patent office related to such property and to consult with Inline regarding the scope and sufficiency of protection. Inline agrees that it will provide reasonable assistance as requested by CAIS in CAIS's prosecution and maintenance of this property, and will timely provide copies of any files or other documentation as requested by CAIS and reasonably required by CAIS to conduct such prosecution and maintenance. Upon assignment of this property to CAIS, CAIS agrees to prosecute the applications for the property in the following countries at a minimum: United Kingdom, Germany, France and Canada. The parties acknowledge that this assignment shall not affect any rights held by Terk Technologies Corp. under a License Agreement between Terk Technologies and Inline dated December 17, 1994. If the above reflects your understanding, please so Acknowledge by countersigning below on behalf of CAIS. Sincerely, Inline Connection Corporation By: /s/ David D. Goodman --------------------- David D. Goodman, President Acknowledged: CAIS, Inc. By: /s/ Ulysses G. Auger, II ------------------------- Ulysses G. Auger, II, President 1/6/99 ------------- Date cc. Gary Walpert, Esquire Jace Holman, Esquire