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Share Exchange Agreement - Entrust Technologies Inc., Entrust Technologies Ltd. and Northern Telecom Ltd.

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                            SHARE EXCHANGE AGREEMENT
                            ------------------------


          MEMORANDUM OF AGREEMENT made as of the 31st day of December, 1996.

AMONG:

                    ENTRUST TECHNOLOGIES INC.,
                    a corporation existing under the
                    laws of the State of Maryland

                    (hereinafter referred to as "Entrust"),


                                              OF THE FIRST PART,

                                    - and -

                    ENTRUST TECHNOLOGIES LIMITED,
                    a corporation existing under the laws of the
                    Province of Ontario,

                    (hereinafter referred to as the "Corporation"),

                                              OF THE SECOND PART,

                                    - and -

                    NORTHERN TELECOM LIMITED,
                    a corporation existing under the laws of
                    Canada, and the holder of non-voting exchangeable
                    shares in the capital of the Corporation,

                    (hereinafter referred to as "Nortel"),

                                              OF THE THIRD PART.


          WHEREAS the parties agree that Entrust is to grant to and in favour of
Nortel and such other holders (other than Entrust) from time to time of
exchangeable non-voting shares in the capital of the Corporation (the
"Exchangeable Shares") the right, in the circumstances set forth herein, to
require Entrust to purchase from each such holder, as the case may be, all or
any part of the Exchangeable Shares held by such holder;
<PAGE>
 
          NOW THEREFORE in consideration of the respective covenants and
agreements provided in this Agreement and for other good and valuable
consideration (the receipt and sufficiency of which are hereby acknowledged),
the parties hereto hereby agree as follows:

                                   ARTICLE 1

                         DEFINITIONS AND INTERPRETATION
                         ------------------------------

1.1       DEFINITIONS.  In this Agreement, the following terms shall have the
          -----------                                                        
following meanings and all other capitalized words and expressions used but not
otherwise defined herein shall have the meanings ascribed to such words and
expressions in the rights, restrictions, privileges and conditions set forth in
the provisions attaching to the Exchangeable Shares, unless the context requires
otherwise:

          "AUTOMATIC EXCHANGE RIGHTS" means the benefit of the obligation of
Entrust to effect the automatic exchange of Entrust Common Shares for
Exchangeable Shares pursuant to subsection 2.11(b) hereof.

          "CALL RIGHTS" means collectively the Liquidation Call Right, the
Redemption Call Right and the Retraction Call Right.

          "DEFAULT EVENT" means any failure, other than by reason of an
Insolvency Event, of the Corporation to perform any of its obligations pursuant
to the Exchangeable Share Provisions including, without limitation, its
obligation to redeem any Retracted Shares.

          "ENTRUST COMMON SHARES" means the shares of common stock, par value
U.S. $0.01 per share, in the capital of Entrust.

          "ENTRUST SUCCESSOR" has the meaning ascribed thereto in subsection
3.1(a) hereof.

          "EXCHANGE RIGHT" has the meaning ascribed thereto in section 2.1
hereof.

          "EXCHANGEABLE SHARE PROVISIONS" means the rights, privileges,
restrictions and conditions set forth in the provisions attaching to the
Exchangeable Shares.

          "EXCHANGEABLE SHARES" has the meaning ascribed thereto in the recitals
hereto.

          "HOLDERS" means the registered holders from time to time of

                                       2
<PAGE>
 
Exchangeable Shares including, without limitation, Nortel but excluding Entrust.

          "INSOLVENCY EVENT"  means the institution by the Corporation of any
proceeding to be adjudicated a bankrupt or insolvent or to be dissolved or wound
up, or the consent of the Corporation to the institution of bankruptcy,
insolvency, dissolution or winding up proceedings against it, or the filing of a
petition, answer or consent seeking dissolution or winding up under any
bankruptcy, insolvency or analogous laws, including without limitation the
Companies Creditors' Arrangement Act (Canada) and the Bankruptcy and Insolvency
Act (Canada), and the failure by the Corporation to contest in good faith any
such proceedings commenced in respect of the Corporation within 15 days of
becoming aware thereof, or the consent by the Corporation to the filing of any
such petition or to the appointment of a receiver, or the making by the
Corporation of a general assignment for the benefit of creditors, or the
admission in writing by the Corporation of its inability to pay its debts
generally as they become due, or the Corporation not being permitted, pursuant
to solvency requirements of applicable law, to redeem any Retracted Shares
pursuant to section 5.6 of the Exchangeable Share Provisions.

          "LIQUIDATION EVENT" has the meaning ascribed thereto in subsection
2.11(a) hereof.

          "LIQUIDATION EVENT EFFECTIVE DATE" has the meaning ascribed thereto in
subsection 2.11(b) hereof.

          "OFFICER'S CERTIFICATE" means, with respect to Entrust or the
Corporation, as the case may be, a certificate signed by any one of the Chairman
of the Board, the President, any Vice-President or any other senior officer of
Entrust or the Corporation, as the case may be.

          "PERSON" includes an individual, partnership, corporation, company,
unincorporated syndicate or organization, trust, trustee, executor,
administrator and other legal representative.

          "RETRACTED SHARES" has the meaning ascribed thereto in section 2.6
hereof.

          "SUPPORT AGREEMENT" means the support agreement made as of even date
herewith between the Corporation and Entrust.

1.2       INTERPRETATION NOT AFFECTED BY HEADINGS, ETC.  The division of this
          ---------------------------------------------                      
Agreement into articles, sections and paragraphs and the insertion of headings
are for convenience of reference only and shall not affect the construction or
interpretation of this Agreement.

                                       3
<PAGE>
 
1.3       NUMBER, GENDER, ETC.  In this Agreement, words importing the singular
          --------------------                                                 
number only shall include the plural and vice versa, and words importing the use
of any gender shall include all genders.

1.4       DATE FOR ANY ACTION.  If any date on which any action is required to
          -------------------                                                 
be taken under this Agreement is not a Business Day, such action shall be
required to be taken on the next succeeding Business Day.

1.5       WITHHOLDING OF TAX.  All amounts required to be paid, deposited or
          ------------------                                                
delivered hereunder shall be paid, deposited or delivered after deduction of any
amount required by applicable law to be deducted or withheld on account of tax
and the deduction of such amounts and remittance to the applicable tax
authorities shall, to the extent thereof, satisfy such requirement to pay,
deposit or deliver hereunder.


                                   ARTICLE 2

                  EXCHANGE RIGHT AND AUTOMATIC EXCHANGE RIGHTS
                  --------------------------------------------

2.1       GRANT AND OWNERSHIP OF THE EXCHANGE RIGHT.  In consideration of the
          -----------------------------------------                          
granting of the Call Rights to Entrust, Entrust hereby grants to the Holders (a)
the right (the "Exchange Right"), upon the occurrence and during the continuance
of an Insolvency Event or a Default Event, to require Entrust to purchase from
each Holder all or any part of the Exchangeable Shares held by such Holder, and
(b) the Automatic Exchange Rights, all in accordance with the provisions of this
Agreement.

2.2       LEGENDED SHARE CERTIFICATES.  The Corporation shall cause each
          ---------------------------                                   
certificate representing Exchangeable Shares to bear an appropriate legend
notifying the Holders of:

     (a)  the right to exercise the Exchange Right in respect of the
          Exchangeable Shares held by a Holder; and

     (b)  the Automatic Exchange Rights.

2.3       PURCHASE PRICE.  The purchase price payable by Entrust for each
          --------------                                                 
Exchangeable Share to be purchased by Entrust under the Exchange Right shall be
an amount per share equal to (a) the Current Market Price multiplied by the
Current Entrust Common Share Equivalent, in each case determined on the day of
closing of the purchase and sale of such Exchangeable Share under the Exchange
Right, which shall be satisfied in full in respect of the Exchangeable Shares in
regard to which a Holder has exercised the Exchange Right by causing to be
delivered to such Holder such whole number of Entrust Common Shares as is equal
to the product obtained by multiplying the number of such Exchangeable Shares by
the Current Entrust 

                                       4
<PAGE>
 
Common Share Equivalent (together with an amount in lieu of any fractional
Entrust Common Share resulting from such calculation payable in accordance with
section 10.4 of the Exchangeable Share Provisions), plus (b) the aggregate of
all dividends declared and unpaid on each such Exchangeable Share (provided that
if the record date for any such declared and unpaid dividends occurs on or after
the day of closing of such purchase and sale the purchase price shall not
include such declared and unpaid dividends).

2.4       EXERCISE OF THE EXCHANGE RIGHT.  Subject to the terms and conditions
          ------------------------------                                      
herein set forth, a Holder shall be entitled, upon the occurrence and during the
continuance of an Insolvency Event or a Default Event, to exercise the Exchange
Right with respect to all or any part of the Exchangeable Shares registered in
the name of such Holder on the books of the Corporation.  To exercise the
Exchange Right, the Holder shall deliver to Entrust, in person, by courier or by
certified or registered mail, at its principal office or at such other place as
Entrust may from time to time designate by written notice to the Holders, the
certificates representing the Exchangeable Shares that such Holder desires
Entrust to purchase pursuant to the Exchange Right, duly endorsed in blank, and
accompanied by such other documents and instruments as Entrust may reasonably
require together with:

     (a)  a duly completed form of notice of exercise of the Exchange Right,
          contained on the reverse of or attached to the Exchangeable Share
          certificates, stating (i) that the Holder thereby exercises the
          Exchange Right so as to require Entrust to purchase from the Holder
          the number of Exchangeable Shares specified therein, (ii) that such
          Holder has good title to and owns all such Exchangeable Shares to be
          acquired by Entrust free and clear of all Liens, (iii) the names in
          which the certificates representing Entrust Common Shares issuable in
          connection with the exercise of the Exchange Right are to be issued,
          and (iv) the names and addresses of the persons to whom such new
          certificates should be delivered; and

     (b)  payment (or evidence satisfactory to Entrust of payment) of the taxes
          (if any) payable as contemplated by section 2.7 of this Agreement.

If only a part of the Exchangeable Shares represented by any certificate or
certificates delivered to Entrust are to be purchased by Entrust under the
Exchange Right, a new certificate for the balance of such Exchangeable Shares
shall be issued to the Holder at the expense of the Corporation.

2.5       DELIVERY OF ENTRUST COMMON SHARES: EFFECT OF EXERCISE.  Promptly after
          -----------------------------------------------------                 
receipt of the certificates, duly endorsed in blank, representing the
Exchangeable Shares in respect of which the Exchange Right was exercised
pursuant to section 2.4 (together with such documents and instruments of
transfer and a duly completed 

                                       5
<PAGE>
 
form of notice of exercise of the Exchange Right (and payment of taxes, if any,
or evidence thereof in accordance with section 2.4)), Entrust shall notify the
Corporation of its receipt of the same and Entrust shall immediately thereafter
deliver or cause to be delivered to the Holder of such Exchangeable Shares (or
to such other persons, if any, properly designated by such Holder), the
certificates for the number of Entrust Common Shares issuable in connection with
the exercise of the Exchange Right, which shares shall be duly issued as fully
paid and non-assessable and shall be free and clear of any Liens, and cheques
for the balance, if any, of the total purchase price therefor (or, if part of
the purchase price consists of dividends payable in property, such property or
property the same as or economically equivalent to such property). Immediately
upon the exercise of the Exchange Right, as provided in section 2.4, the closing
of the transaction of purchase and sale contemplated by the Exchange Right shall
be deemed to have occurred, and the Holder of such Exchangeable Shares shall be
deemed to have transferred to Entrust all of its right, title and interest in
and to such Exchangeable Shares and shall cease to be a holder of such
Exchangeable Shares and shall not be entitled to exercise any of the rights of a
holder in respect thereof, other than the right to receive the purchase price
therefor, unless the requisite number of Entrust Common Shares (together with a
cheque for the balance, if any, of the purchase price therefor or, if part of
the purchase price consists of dividends payable in property, such property or
property the same as or economically equivalent to such property) is not
allotted, issued and delivered by Entrust to such Holder (or to such other
persons, if any, properly designated by such Holder) within five Business Days
of the date of the exercise of the Exchange Right, in which case the rights of
the Holder shall remain unaffected until such Entrust Common Shares are so
allotted, issued and delivered by Entrust and any such cheque or property is so
delivered and paid. Concurrently with such Holder ceasing to be a holder of
Exchangeable Shares, the Holder shall be considered and deemed for all purposes
to be the holder of the Entrust Common Shares delivered to it pursuant to the
Exchange Right. The Board of Directors shall sanction or approve any transfer of
Exchangeable Shares made pursuant to an exercise of the Exchange Right pursuant
to the provisions hereof and such sanction or approval shall be effective as at
the closing of the transaction of purchase and sale of Exchangeable Shares as
provided in this section 2.5.

2.6       EXERCISE OF EXCHANGE RIGHT SUBSEQUENT TO RETRACTION.  In the event
          ---------------------------------------------------               
that a Holder has exercised its right under Article 5 of the Exchangeable Share
Provisions to require the Corporation to redeem any or all of the Exchangeable
Shares held by the Holder (the "Retracted Shares") and is notified by the
Corporation pursuant to section 5.6 of the Exchangeable Share  Provisions that
the Corporation is not permitted as a result of solvency requirements of
applicable law to redeem all of such Retracted Shares, and provided that Entrust
shall not have exercised the Retraction Call Right with respect to the Retracted
Shares, the retraction request shall constitute and shall be deemed to
constitute an exercise of the Exchange Right with respect to those Retracted
Shares that the Corporation is unable to redeem.  In any 

                                       6
<PAGE>
 
such event, the Corporation hereby agrees with the Holder immediately to notify
Entrust of such prohibition against the Corporation redeeming all of the
Retracted Shares and immediately to forward or cause to be forwarded to Entrust
all relevant materials delivered by the Holder to the Corporation (including
without limitation a copy of the retraction request delivered pursuant to
section 5.1 of the Exchangeable Share Provisions) in connection with such
proposed redemption of the Retracted Shares and Entrust shall thereupon purchase
the Retracted Shares that the Corporation is not permitted to redeem in
accordance with the provisions of this Article 2.

2.7       STAMP OR OTHER TRANSFER TAXES.  Upon any sale of Exchangeable Shares
          -----------------------------                                       
to Entrust pursuant to the Exchange Right or the Automatic Exchange Rights, the
share certificate or certificates representing Entrust Common Shares to be
delivered in connection with the payment of the purchase price therefor shall be
issued in the name of the Holder of the Exchangeable Shares so sold or in such
names as such Holder may otherwise direct in writing without charge to the
Holder, provided, however, that such Holder (a) shall pay (and neither Entrust
nor the Corporation shall be required to pay) any documentary, stamp, transfer
or other similar taxes that may be payable in respect of any transfer involved
in the issuance or delivery of such shares to a person other than such Holder or
(b) shall establish to the satisfaction of Entrust and the Corporation that such
taxes, if any, have been paid.

2.8       NOTICE OF INSOLVENCY EVENT OR DEFAULT EVENT.  Immediately upon the
          -------------------------------------------                       
occurrence of an Insolvency Event or a Default Event or any event that with the
giving of notice or the passage of time or both would be an Insolvency Event or
a Default Event, the Corporation and Entrust shall give written notice thereof
to the Holders.  Such notice shall describe the event that has occurred and
shall specify that, pursuant to this Agreement, the Holders are currently
entitled, or may become entitled at a later date, to exercise the Exchange
Right.

2.9       QUALIFICATION OF ENTRUST COMMON SHARES.  Entrust shall use all
          --------------------------------------                        
reasonable efforts to obtain or have available exemptions from the registration
and prospectus requirements of applicable Canadian and United States securities
laws to permit the issuance of the Entrust Common Shares upon any exchange of
the Exchangeable Shares for Entrust Common Shares pursuant to this agreement to
the extent possible without registration or qualification with, or approval of,
or the filing of any registration statement or prospectus or similar document
with, any Canadian or United States securities authorities.

2.1       RESERVATION OF ENTRUST COMMON SHARES.  Entrust hereby represents and
          ------------------------------------                                
warrants that it has irrevocably reserved for issuance out of its authorized and
unissued capital stock such number of Entrust Common Shares as is equal to the
number of Exchangeable Shares outstanding at the date hereof and covenants that
it will at all times keep available, free from pre-emptive and other rights, out
of its 

                                       7
<PAGE>
 
authorized and unissued capital stock such number of Entrust Common Shares (or
other shares or securities into which Entrust Common Shares may be reclassified
or changed) as is necessary to enable Entrust to perform its obligations
pursuant to this Agreement.

2.11      AUTOMATIC EXCHANGE ON LIQUIDATION OF ENTRUST.
          -------------------------------------------- 

     (a)  Entrust shall give the Holders notice of each of the following events
(a "Liquidation Event") at the time set forth below:

          (i)   in the event of any determination by the board of directors of
                Entrust to institute voluntary liquidation, dissolution or
                winding-up proceedings with respect to Entrust or to effect any
                other distribution of assets of Entrust among its stockholders
                for the purpose of winding up its affairs, at least 60 days
                prior to the proposed effective date of such liquidation,
                dissolution, winding-up or other distribution; and

          (ii)  immediately, upon the earlier of (A) receipt by Entrust of
                notice of and (B) Entrust otherwise becoming aware of any
                threatened or instituted claim, suit, petition or other
                proceedings with respect to the involuntary liquidation,
                dissolution or winding up of Entrust or to effect any other
                distribution of assets of Entrust among its stockholders for the
                purpose of winding up its affairs.

Such notice shall describe the event that has occurred and shall specify that,
pursuant to this Agreement, the occurrence of such event causes the Exchangeable
Shares to be exchanged automatically for Entrust Common Shares.

     (b)  In order that the Holders will be able to participate on a pro rata
basis with the holders of Entrust Common Shares in the distribution of assets of
Entrust in connection with a Liquidation Event, on the fifth Business Day prior
to the effective date of a Liquidation Event (the "Liquidation Event Effective
Date") all of the then outstanding Exchangeable Shares shall be automatically
exchanged for Entrust Common Shares.  To effect such automatic exchange, Entrust
shall purchase each Exchangeable Share outstanding on the fifth Business Day
prior to the Liquidation Event Effective Date and held by Holders, and each
Holder shall sell the Exchangeable Shares held by it at such time, for a
purchase price per share equal to (a) the Current Market Price multiplied by the
Current Entrust Common Share Equivalent on such fifth Business Day prior to the
Liquidation Event Effective Date, which shall be satisfied in full in respect of
the Exchangeable Shares held by each Holder by Entrust issuing to such Holder
such whole number of Entrust Common Shares as is equal to the product obtained
by multiplying the number of such Exchangeable Shares by the Current Entrust
Common Share Equivalent (together 

                                       8
<PAGE>
 
with an amount in lieu of any fractional Entrust Common Share resulting from
such calculation payable in accordance with section 10.4 of the Exchangeable
Share Provisions), plus (b) an additional amount equal to the aggregate of all
dividends declared and unpaid on each such Exchangeable Share (provided that if
the record date for any such declared and unpaid dividends occurs on or after
the day of closing of such purchase and sale, the purchase price shall not
include such additional amount equal to such declared and unpaid dividends). The
Board of Directors shall sanction or approve any transfer of Exchangeable Shares
made pursuant to the Automatic Exchange Rights and such sanction or approval
shall be effective as of the fifth Business Day prior to the Liquidation Event
Effective Date.

     (c)  On the fifth Business Day prior to the Liquidation Event Effective
Date, the closing of the transaction of purchase and sale contemplated by the
automatic exchange of Exchangeable Shares for Entrust Common Shares shall be
deemed to have occurred, and each Holder of Exchangeable Shares shall be deemed
to have transferred to Entrust all of the Holder's right, title and interest in
and to such Exchangeable Shares and shall cease to be a holder of Exchangeable
Shares and Entrust shall issue to the Holder the Entrust Common Shares issuable
upon the automatic exchange of Exchangeable Shares for Entrust Common Shares and
shall deliver to the Holder a cheque for the balance, if any, of the purchase
price for such Exchangeable Shares (or, if any part of the purchase price
consists of dividends payable in property, such property or property that is the
same as or economically equivalent to such property).  Concurrently with such
Holder ceasing to be a holder of Exchangeable Shares, the Holder shall be
considered and deemed for all purposes to be the holder of the Entrust Common
Shares issued to it pursuant to the automatic exchange of Exchangeable Shares
for Entrust Common Shares and the certificates held by the Holder previously
representing the Exchangeable Shares exchanged by the Holder with Entrust
pursuant to such automatic exchange shall thereafter be deemed to represent the
Entrust Common Shares issued to the Holder by Entrust pursuant to such automatic
exchange.  Upon the request of a Holder and the surrender by the Holder of
Exchangeable Share certificates deemed to represent Entrust Common Shares, duly
endorsed in blank and accompanied by such instruments of transfer as Entrust may
reasonably require, Entrust shall deliver or cause to be delivered to the Holder
certificates representing the Entrust Common Shares of which the Holder is the
holder.


                                   ARTICLE 3

                               ENTRUST SUCCESSORS
                               ------------------

3.1       CERTAIN REQUIREMENTS IN RESPECT OF COMBINATION, ETC.  Entrust shall
          ----------------------------------------------------               
not enter into any transaction (whether by way of reconstruction,
reorganization, consolidation, merger, transfer, sale, lease or otherwise)
whereby all or substantially 

                                       9
<PAGE>
 
all of its undertaking, property and assets would become the property of any
other person or, in the case of a merger, of the continuing corporation
resulting therefrom, unless:

     (a)  such other person or continuing corporation is a corporation (herein
          called the "Entrust Successors") incorporated under the laws of any
          state of the United States or the laws of Canada or any province
          thereof; and

     (b)  Entrust Successor, by operation of law, becomes, without more, bound
          by the terms and provisions of this Agreement or, if not so bound,
          executes, prior to or contemporaneously with the consummation of such
          transaction an agreement supplemental hereto and such other
          instruments (if any) as are satisfactory to the Holders, acting
          reasonably, to evidence the assumption by Entrust Successor of
          liability for all moneys payable and property deliverable hereunder
          and the covenant of such Entrust Successor to pay and deliver or cause
          to be delivered the same and its agreement to observe and perform all
          the covenants and obligations of Entrust under this Agreement.

3.2       VESTING OF POWERS IN SUCCESSOR.  Whenever the conditions of section
          ------------------------------                                     
3.1 hereof have been duly observed and performed, the Holders, if required by
section 3.1 hereof, Entrust Successor and the Corporation shall execute and
deliver a supplemental agreement provided for in section 4.1 hereof and
thereupon Entrust Successor shall possess and from time to time may exercise
each and every right and power of Entrust under this Agreement in the name of
Entrust or otherwise and any act or proceeding by any provision of this
Agreement required to be done or performed by the board of directors of Entrust
or any officers of Entrust may be done and performed with like force and effect
by the directors or officers of such Entrust Successors.

3.3       WHOLLY-OWNED SUBSIDIARIES.  Nothing herein shall be construed as
          -------------------------                                       
preventing the amalgamation or merger of any wholly-owned subsidiary of Entrust
with or into Entrust.


                                   ARTICLE 4

                     AMENDMENTS AND SUPPLEMENTAL AGREEMENTS
                     --------------------------------------

4.1       AMENDMENTS, MODIFICATIONS, ETC.  Except as provided for in section
          -------------------------------                                   
4.2, this Agreement may not be amended or modified except by an agreement in
writing executed by the Corporation, Entrust and the Holders.  From time to time
the Corporation (when authorized by a resolution of the Board of Directors),
Entrust (when authorized by a resolution of its board of directors) and the
Holders may, 

                                       10
<PAGE>
 
subject to the provisions hereof, and they shall, when so directed by these
presents, execute and deliver by their proper officers, agreements or other
instruments supplemental hereto, which thereafter shall form part hereof, for
evidencing the succession of Entrust Successors to Entrust and the covenants of
and obligations assumed by each such Entrust Successor in accordance with the
provisions of Article 3.

4.2       CHANGES IN THE CAPITAL OF ENTRUST OR THE CORPORATION. Notwithstanding
          -----------------------------------------------------                
section 4.1, at all times after the occurrence of any Entrust Common Share
Reorganization or Capital Reorganization (as such terms are respectively defined
in the Exchangeable Share Provisions) or other change in either the Entrust
Common Shares or the Exchangeable Shares or both, this Agreement shall forthwith
be deemed to have been amended and modified as necessary in order that it shall
apply with full force and effect, mutatis mutandis, to all new securities into
which Entrust Common Shares or the Exchangeable Shares or both are so changed
and the parties hereto shall execute and deliver an agreement giving effect to
and evidencing such necessary amendments and modifications.


                                   ARTICLE 5

                        TRANSFERS OF EXCHANGEABLE SHARES
                        --------------------------------

5.1       APPROVAL OF THE BOARD OF DIRECTORS.  Except for any transfers of
          ----------------------------------                              
Exchangeable Shares to Entrust or any of its Affiliates pursuant to the
provisions hereof or the Exchangeable Share Provisions, the Holders shall not be
entitled to transfer any Exchangeable Shares except as permitted pursuant to the
articles of incorporation of the Corporation.  Entrust and the Board of
Directors shall not sanction any transfer of Exchangeable Shares (other than to
Entrust or any of its Affiliates pursuant to the provisions hereof or the
Exchangeable Share Provisions) unless, as a condition precedent to any such
transfer of Exchangeable Shares, the transferee, if it is not a party to this
Agreement, executes and delivers an agreement in form and containing terms
satisfactory to Entrust and the Corporation, acting reasonably, whereby the
transferee shall become a party hereto and shall agree to be bound by the
provisions hereof as if the transferee was an original party hereto, and
thereupon the transferee shall have the same rights, and shall be subject to the
same obligations, as the transferor hereunder.

                                       11
<PAGE>
 
                                   ARTICLE 6

                                  TERMINATION
                                  -----------

6.1       TERM.
          ---- 

     (a)  This Agreement, including the Exchange Right and the Automatic
Exchange Rights, shall come into force and effect as at and from the date hereof
and shall remain in force and effect until the earliest to occur of the
following events, at which time this Agreement shall terminate:

          (i)   no outstanding Exchangeable Shares are held by any Holder; and

          (ii)  each of the Holders, the Corporation and Entrust agree in
                writing to terminate this Agreement.

     (b)  Notwithstanding anything herein to the contrary, the provisions of
this Agreement shall no longer be applicable to any person (including, without
limitation, any Seller) that ceases to be a registered holder of Exchangeable
Shares and such person shall, upon ceasing to be a registered holder of
Exchangeable Shares, be deemed to have ceased to be a party to this Agreement
until, if applicable, such time as such person subsequently becomes a party to
this Agreement by executing an agreement referred to in Section 5.1.


                                   ARTICLE 7

                                    GENERAL
                                    -------

7.1       SEVERABILITY.  If any provision of this Agreement is held to be 
          ------------              
invalid, illegal or unenforceable, the validity, legality or enforceability of
the remainder of this Agreement shall not in any way be affected or impaired
thereby and this Agreement shall be carried out as nearly as possible in
accordance with its original terms and conditions; provided, however, that if
the provision or provisions so held to be invalid, in the reasonable judgment of
the parties, is or are so fundamental to the intent of the parties and the
operation of this Agreement that the enforcement of the other provisions hereof,
in the absence of such invalid provision or provisions, would damage irreparably
the intent of the parties in entering into this Agreement, the parties shall
agree (i) to terminate this Agreement, or (ii) to amend or otherwise modify this
Agreement so as to carry out the intent and purposes hereof and the transactions
contemplated hereby.

7.2       INUREMENT.  Subject to the provisions of Article 6, this Agreement 
          ---------               
shall be binding upon and inure to the benefit of the parties hereto and their
respective 

                                       12
<PAGE>
 
successors and permitted assigns and to the benefits of the Holders.

7.3       NOTICE TO PARTIES.  All notices and other communications between the
          -----------------                                                   
parties shall be in writing and shall be deemed to have been given if delivered
personally or by confirmed telecopy to the parties at the following addresses
(or at such other address for either such party as shall be specified in like
notice):

          (a)  if to Entrust at:

               Entrust Technologies Inc.
               2 Constellation Crescent
               Nepean, Ontario
               K2G 5J9

               Attention:  President
               ---------------------

          (b)  if to the Corporation at:

               Entrust Technologies Limited
               2 Constellation Crescent
               Nepean, Ontario
               K2G 5J9

               Attention:  President
               ---------------------

          (c)  if to Nortel at:

               Northern Telecom Limited
               8200 Dixie Road
               Suite 100
               Brampton, Ontario
               L6T 5P6

               Attention:  Corporate Secretary
               -------------------------------

          (d)  if to any other Holder, at such address or telecopy specified in
               a notice given by such Holder to the other parties hereto
               pursuant to the provisions of this section 7.3, failing which
               any notice required to be given to such Holder shall be given in
               accordance with the provisions of section 7.4

Any notice or other communication given personally shall be deemed to have been
given and received upon delivery thereof and if given by telecopy shall be
deemed to have been given and received on the date of receipt thereof unless
such day is not a 

                                       13
<PAGE>
 
Business Day or unless such notice or communication was not given during the
normal business hours of the recipient on such day, in which case it shall be
deemed to have been given and received upon the immediately following Business
Day.

7.4       NOTICE TO HOLDERS.  If a Holder does not provide an address for 
          -----------------               
delivering a notice pursuant to subsection 7.3(f), any and all notices to be
given and any documents to be sent to such Holder shall be given or sent to the
address of such Holder shown at the relevant time on the register of Holders
maintained by the Corporation.

7.5       RISK OF PAYMENTS BY POST.  Whenever payments are to be made or 
          ------------------------          
documents are to be sent to any Holder by Entrust or by the Corporation, or by
such Holder to Entrust or the Corporation, the making of such payment or sending
of such document sent through the post shall be at the risk of:

     (a)  Entrust, in the case of payments made or documents sent by Entrust;

     (b)  the Corporation, in the case of payments made or documents sent by the
          Corporation; and

     (c)  the Holder, in the case of payments made or documents sent by the
          Holder.

7.6       COUNTERPARTS.  This Agreement and any amendments or supplements 
          ------------               
thereto may be executed in counterparts, each of which shall be deemed an
original, but all of which taken together shall constitute one and the same
instrument.

7.7       JURISDICTION.  This Agreement shall be construed and enforced in 
          ------------                              
accordance with the laws of the Province of Ontario and the laws of Canada
applicable therein.

7.8       ATTORNMENT.  Entrust agrees that any action or proceeding arising 
          ----------                  
out of or relating to this Agreement may be instituted in the courts of the
Province of Ontario, waives any objection which it may have now or hereafter to
the venue of any such action or proceeding, irrevocably submits to the
jurisdiction of the said courts in any such action or proceeding, agrees to be
bound by any judgment of the said courts and agrees not to seek, and hereby
waives, any review of the merits of any such judgment by the courts of any other
jurisdiction and hereby appoints Entrust Technologies Limited, 2 Constellation
Crescent, Nepean, Ontario K2G 5J9 as Entrust's attorney for service of process
in Ontario.

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<PAGE>
 
          IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.

                              ENTRUST TECHNOLOGIES INC.


                              by  /s/ John Ryan
                                  ------------------------------------
                                      President
                                  ------------------------------------



                              ENTRUST TECHNOLOGIES LIMITED


                              by  /s/ John Ryan
                                  ------------------------------------
                                      President
                                  ------------------------------------


                              NORTHERN TELECOM LIMITED


                              by  /s/ Peter W. Currie
                                  ------------------------------------

                                  /s/ David A. Archibald
                                  ------------------------------------

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