Document:

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                                                            Exhibit 10.2
                                                            ------------

                               RELEASE AGREEMENT

This agreement is made between:

     BRADLEY ROSS, for himself, his heirs, dependents, executors,
     administrators, successors and assigns; hereinafter referred to as
     "Employee",

                                      and

     ENTRUST TECHNOLOGIES INC. and ENTRUST TECHNOLOGIES LTD.; hereinafter
     referred to as "ENTRUST".

Whereas the Parties wish to terminate the employment relationship between
Entrust and Employee, it is therefore agreed as follows:

IN CONSIDERATION of the payments less the required deductions for income taxes
and other statutory deductions, and other good and valuable consideration as
herein, Employee agrees as follows:

1)   Employee agrees that the contract of employment between himself and ENTRUST
     will be terminated on January 31, 2000 with notice received on June 1,
     1999.

2)   Employee wholly releases ENTRUST, its successors and assigns, its officers
     and directors, shareholders, agents and employees and its affiliated and
     associated companies and assigns, of and from any and all actions, causes
     of actions, complaints, debts, dues, warranties, claims or demands for any
     loss, losses or damage whatsoever in existence prior to, on or after the
     date hereof, directly or indirectly arising from his employment with
     ENTRUST or the
<PAGE>

     termination thereof. Without limiting the generality of the foregoing,
     Employee acknowledges that the said payment is in satisfaction of all
     claims for damages for wrongful dismissal including all non-salary benefits
     ordinarily provided to or on his behalf in respect of the employment,
     vacation pay, any and all expenses whether incurred before, on or after the
     date hereof in respect of the employment and as more particularly described
     in his International Assignment Agreement dated September 30, 1998 and his
     Offer of Employment dated November 18, 1996 and any and all claims which
     Employee may have had under the Employment Standards Act and the Human
     Rights Code of Ontario or the Canada Labour Code.

3)   Employee agrees not to make any claims or take any proceedings against any
     other person or corporation which might claim contribution or indemnity
     from ENTRUST under the provisions of any statute or otherwise with respect
     to any matter which arose or may have arisen between ENTRUST and Employee
     at the present time.

4)   Employee agrees to indemnify and save harmless ENTRUST from and against any
     and all claims, actions, causes of action, debts or demands under the
     Income Tax Act for or in respect of withholding taxes relating to the
     cessation of his employment together with any interest or penalties
     relating thereto and any costs or expenses incurred by ENTURST in defending
     such claim, cause of action, demand, debt or assessment by Revenue Canada
     or by any other taxing authority.

5)   Employee agrees that the terms of his non-compete agreement described in
     his employment offer letter dated November 18, 1996, which provide that he
     may not compete with ENTRUST, are hereby modified to include Europe in
     addition to Canada and the United States and will take effect on his
     termination date of January 31, 2000 and remain effective
<PAGE>

     until January 31, 2001. Notwithstanding the foregoing, if a court finds
     that the addition of Europe make the non- competition terms unenforceable,
     the parties agree that Section 5 is severable from this agreement and the
     non-competition terms.

6)   Employee agrees to resign as member of the Board of Security Engineering AG
     effective July 15, 1999 or as soon as notice of a replacement being
     appointed is received, whichever comes first.

7)   Employee understands that, as an employee, he remains subject to ENTRUST's
     insider trading restrictions until January 31, 2000 and that although he is
     no longer subject to SEC Section 16b reporting, he will continue to abide
     by the trade restrictions in place for 16b Officers until January 31, 2000.

8)   Employee agrees to return to Entrust any and all company property on or
     before the termination date and agrees to fulfill his obligations as a
     departing employee not to disclose confidential or proprietary information.
     Employee continues to be bound by the Conflict of Interest and the
     Intellectual Property and Confidentiality agreements. Furthermore, Employee
     will not speak of Entrust or Nortel or any of their employees, officers or
     representatives, in disparaging terms nor in any other negative way
     communicate about his employment with Entrust.

9)   Employee acknowledges and agrees that the payment referred to herein does
     not represent any admission or recognition of liability by ENTRUST.

10)  Employee further acknowledges and agrees that the terms of this Release
     Agreement are fully understood by him, that Employee has had independent
     legal representation in connection with this Release Agreement and that
     this Release Agreement is voluntarily entered into by him.
<PAGE>

IN CONSIDERATION of the covenants made above, ENTRUST agrees to provide as
follows:

1)   Eight months notice to Employee of intent to terminate employment, provided
     on June 1, 1999 with termination date of January 31, 2000, whereby Employee
     shall work through the notice period.

2)   Lump sum payment to Employee of CHF53,334.00 less applicable taxes, plus
     outstanding reimbursements for Entrust business expenses (if any), to be
     paid on or before February 15, 2000.

3)   Benefits (specifically health, insurance and social security benefits)
     continuation until January 31, 2000 followed by a lump sum payment on or
     before February 15, 2000 of CHF 3,333.34 less applicable taxes, for 4
     months benefits compensation. An additional lump sum payment of CHF
     7,500.00 will also be provided in lieu of relocation expenses. Vacation,
     earned and accrued, is to be taken during the 8 month notice period. As fo
     June 30, 1999, other benefits associated with the International Assignment
     Agreement will be discontinued including: cost of living allowance, company
     paid house rental in Zurich, storage of household goods in Canada, home
     management service for apartment in Canada, relocation expenses for return
     to Canada, personal transportation allowance and return trips home. For
     clarity, ENTRUST will deduct from rental proceeds any actual repair or
     maintenance up to CDN$2,500, with remaining expenses, if any, to be
     Employee's responsibility. Condo fees of CDN$355.67 per month can be
     expensed through June 30.

4)   Company paid preparation of Canadian and foreign income tax returns for the
     years 1998 and 1999.
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5)   Stock option vesting through January 31, 2000, (provided the Employee works
     through the notice period) after which any remaining unvested option will
     be forfeited. Specifically, the Parties understand and agree that of the
     602,400 options with a strike price of US$2.125 granted to Employee on
     January 1, 1997, of which 361,440 options have vested as of January 1,
     1999; an additional 120,480 options will vest as of January 1, 2000, for a
     total of 481,920 options that Employee will have acquired rights to
     exercise by January 1, 2000.

6)   The following company property and contracts are assigned, to the extent
     possible, to Brad Ross without charge who will take over payment
     obligations to third parties (if any) as of 1st July 1999:

     a)   company purchased furnishings, insurance policy and lease for the
          apartment at Seehofstr. 4, Zurich

     b)   Internet account agreement (bross00@ibm.net)

     c)   mobile phone, account agreement and accessories (+41 79 230 9326)

     d)   computer accessories (monitor, key board, mouse, palmpilot, external
          disk drive, memory, port replicator, power supply, SCSI card). All
          company proprietary information contained on the computer must be
          immediately deleted and verification of deletion provided to Entrust
          through a certified statement signed by Brad Ross.

     e)   Prudential home management agreement (2108-1500 Riverside Dr., Ottawa)

     f)   Swiss rail passes

     g)   art work from the office of Brad Ross (4 framed Entrust graphics)

     h)   assignment, to the extent possible, and transfer assistance for health
          insurance and remaining benefits to Brad Ross who will take over
          payment obligations to third parties (if any) as of February 1, 2000.
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     i)   auto responder service until June 1, 2000 on brad.ross@entrust.com
                                                       ---------------------
          indicating that the new e-mail address is bross00@ibm.net.
                                                    ---------------

7)   ENTRUST fully releases Employee of and from any and all actions, causes of
     actions, complaints, debts, dues, warranties, claims or demands for any
     loss, losses or damage whatsoever in existence prior to, on or after the
     date hereof, directly or indirectly arising from conduct within the
     authorized scope of his employment that was or ought to have been known to
     ENTRUST.

8)   ENTRUST agrees not to make any claims or take any proceedings against any
     other person or corporation which might claim contribution or indemnity
     from Employee under the provisions of any statute or otherwise with respect
     to the Employee's conduct within the authorized scope of his employment
     that was or ought to have been known to ENTRUST.

9)   ENTRUST agrees to indemnify and save harmless Employee from and against any
     and all claims, actions, causes of action, debts or demands from a third
     party relating to conduct within the authorized scope of his employment
     together with any interest or penalties relating thereto and any costs or
     expenses incurred by Employee in defending such claim, cause of action,
     demand, debt or assessment by such third party.

10)  ENTRUST will not speak of Employee in disparaging terms nor in any other
     negative way communicate about his employment with Entrust.

The Parties understand and agree that the fact of settlement between Employee
and ENTRUST and the terms of same are confidential to the Parties and must not
be disclosed to any person, save and except counsel representing the Parties and
as may be required by law.
<PAGE>

This Agreement is governed by the laws of Ontario.

Employee directs that the payment of the amounts under this agreement be made by
direct deposit to his personal bank account of record at Credit Suisse, Zurich.

IN WITNESS WHEREOF the Parties have duly executed this Agreement.

/s/ Michele A. Axelson                            /s/ Bradley Ross
-------------------------------                   -----------------------------
ENTRUST                                           BRADLEY ROSS

Plano, TX, USA  June 29, 1999                     Zurich  30.6.99
-------------------------------                   -----------------------------
Place/Date                                        Place/Date<PAGE>

                                                            Exhibit 10.3
                                                            ------------

September 24, 1999

David Thompson
5505 Kinross Drive
Plano, TX 75093

Dear Dave,

We are pleased to confirm our verbal job offer of Senior Vice President and
Chief Financial Officer with Entrust Technologies Inc. (the "Company") reporting
to John Ryan. Your salary, on an annualized basis, will be $185,000.00 US, which
will be paid biweekly. Your salary and performance will be subject to review on
an annual basis.

You are eligible for an executive bonus of $100,000 annualized, and which is
subject to meeting identified business objectives.

You are also eligible for a signing bonus of $40,000 payable when your
employment begins.

In addition, you will be granted an award of incentive stock options to purchase
200,000 shares of common stock of Entrust with an exercise price equal to the
fair market value of the common stock on the day of grant. This award is subject
to the terms of the Incentive Stock Option Agreement that will be provided to
you in due course.

If you are terminated from the position of Chief Financial Officer within one
year of an Acquisition Event (as defined in the Amended and Restated 1996 Stock
Incentive Plan), and this termination is not by reason of your disability,
retirement, death, resignation or a for cause termination, 50% of your unvested
stock options will vest immediately as of the date the CFO duties are
reassigned.

Benefits, payroll, and other human resource management services are provided
through TriNet Employer Group, Inc. TriNet is an employer services organization
contracted by the Company to perform selected employer responsibilities on our
behalf. As a result of the Company's arrangement with TriNet, TriNet will be
considered your employer of record for payroll, benefits, and other functions
involving employer related administration, including your new hire enrollment
processing. However, as Entrust is the company for which you will perform
service, we will retain the right to control and direct your work, its results,
and the manner and means by which your work is accomplished.

A summary of the benefit plan is enclosed. TriNet will be sending you a package
that includes more complete benefit information along with certain forms that
are required for employment.

With the exception of the provision for at will employment described below,
Entrust Technologies Inc. and/or TriNet may modify, revoke, suspend or terminate
any of the terms, plans, policies and/or procedures described in the employee
handbook or as otherwise communicated to you, in whole or part, at any time,
with or without notice, and Entrust Technologies Inc. may change or terminate
the TriNet relationship at any time.
<PAGE>

As with all employees, your employment with the Company is at will. This means
that your terms and conditions of employment, including but not limited to
termination, demotion, promotion, transfer, compensation, benefits, duties and
location of work may be changed with or without cause, for any or no reason, and
with or without notice. Your status as an at-will employee cannot be changed by
any statement, promise, policy, course of conduct, in writing or manual except
through a written agreement signed by the CEO of the company.

This employment at will offer is contingent upon the following:

 .    Your signing the following agreements and returning with your offer letter:
     Entrust's Conflict of Interest and Intellectual Property and
     Confidentiality. By accepting this offer of employment at will, you also
     agree to any terms and conditions contained in those documents as written
     (included with this letter).

 .    Your completing the employment application (included in TriNet package).

 .    Your ability to provide documentation to establish your identity and
     eligibility for employment as required under the Immigration Reform and
     Control Act of 1986. Please review the enclosed "List of Acceptable
     Documents", and provide the appropriate ones to your manager on your first
     day of employment (included in TriNet package).

We believe that your abilities and our needs are compatible and that your
acceptance of this offer will prove mutually beneficial. However, it is
understood and agreed that your employment is terminable at the will of either
party and is not an employment agreement for a year or any other specified term.

To accept and confirm your start date or to decline this employment at will
offer, please contact me or Tracey Love at 972-943-7312 within five days of this
letter's date. Please sign and return the original offer letter along with all
other required documentation to Tracey Love before your first day of employment.
Any questions should be directed to me.

Sincerely,

John A. Ryan
President and Chief Executive Officer
<PAGE>

I have read, understood, and therefore, accept this offer of employment a will,
as set forth above, and will attend the October 14th Board.

Signature:  /s/ David L. Thompson              Date:  October 11, 1999
            ------------------------------            -----------------------

Upon your acceptance of this offer as set forth above, please provide or confirm
your social security number and date of birth. This will facilitate your
enrollment on our payroll and employee benefit programs.

SS#:  _______________________________________

Date of Birth:  _________________________________

Attachments:

Benefit Plan Summary
Conflict of Interest Agreement
Intellectual Property and Confidentiality Agreement
<PAGE>

                         CONFLICT OF INTEREST AGREEMENT
                         ------------------------------

Every director, officer, and employee will at all times, be conscious of the
interests of Entrust ("the Company"), and will not:

a)   appropriate or convert the Company's property, tangible or intangible,
     including trade secrets, confidential information, and other proprietary
     information;

b)   offer bribes, or accept corrupt payments or other like illegal or unethical
     considerations;

c)   accept gifts or gratuities that cannot be reciprocated in the ordinary
     course of business;

d)   disparage the Company or the Company's products, services or personnel;

e)   influence, in a manner unfavorable to the Company, negotiations or
     transactions between the Company and its suppliers, contractors, customers
     and others, because of a personal, commercial, or financial interest in the
     outcome of the negotiations or transactions;

f)   without prior written permission, or having previously declared the
     activity in a prescribed manner, serve or continue to serve as a director,
     officer, or employee of, or perform, directly or indirectly, services for,
     or act as a consultant to, a business that is or may be:

     i)   in competition with the Company; or

     ii)  a supplier of goods and/or services to the Company;

g)   without prior written permission, directly or indirectly invest in, or
     control, an entity that:

     i)   competes or may compete with a business or activity of the Company; or

     ii)  is or may be a supplier of goods and/or services to the Company;

except, in the case of publicly traded shares, when the investment does not
exceed five percent of the issued shares.

The above examples are merely illustrations of sources of possible conflicts. it
is anticipated that the activities of directors, officers, employees, and
immediate members of their families will comply with both the letter and the
spirit of this Agreement.
<PAGE>

                                       2

Directors, officers, and employees will only trade in shares or securities of
the Company (or of any company with which it has dealings), having full regard
to the provisions of the relevant securities laws dealing with insider trading
and trading in securities.

/s/ David L. Thompson         /s/David L. Thompson         October 11, 1999
---------------------------   ---------------------------  ---------------------
Employee name (print)         Employee signature           Date

/s/ Christopher R. Thompson   /s/ Christopher R. Thompson  October 11, 1999
---------------------------   ---------------------------  ---------------------
Witness name (print)          Witness Signature            Date
<PAGE>

               INTELLECTUAL PROPERTY AND CONFIDENTIALITY AGREEMENT
               ---------------------------------------------------

In consideration of my employment by Entrust ("the Company"), I agree to the
following:

1)   I am under no obligation to anyone, including a former employer, which is
     an impediment to my entering into this Agreement or which imposes any
     restrictions on the activities or duties which may be assigned to me from
     time to time by the Company.

2)   I hereby assign to and waive in favour of the Company all my rights in and
     to all inventions, discoveries, improvements, designs, know-how, technical
     or commercial information, computer programs in any form, written
     materials, data bases, integrated circuit topologies, plans, diagrams,
     drawings, models, and other items, which I may conceive, develop or reduce
     to practice during the period of my employment with the Company and which:

     i)   relate, directly or indirectly, to the Company's present or reasonably
          foreseeable business or research or development; or,

     ii)  result from any work performed by me for the Company; or,

     iii) are created or made using any equipment, supplies, facilities,
          resources, or Confidential Information of the Company;

     whether or not they are made during or after working hours, on or off the
     Company's premises, or alone or with others.

3)   I shall make prompt and full disclosure to the Company of any of the things
     covered in paragraph 2. During and subsequent to my employment, I shall
     sign documents, and provide such assistance, as may be required by the
     Company to obtain, maintain, enforce, protect or grant any rights which I
     have assigned to or waived in favour of the Company and which the Company
     may desire in respect of such things in all countries of the world.

4)   I shall not (except as expressly permitted by the Company in writing) at
     any time during and subsequent to my employment with the Company:

     i)   disclose, or authorize the disclosure, to anyone other than authorized
          officers or employees of the Company; or,

     ii)  use for non-Company purposes or other non-permitted purposes;

     any of the Company's Confidential Information or any other information
     disclosed to the Company by a third party in circumstances which oblige the
     Company to protect such information from unauthorized use and/or
     disclosure.

5)   "Confidential Information" for the purposes of this Agreement shall mean
     all information, including trade secrets, formulas, patterns, compilations,
     programs, devices, methods, techniques, or processes, of a business,
     planning, marketing, scientific,
<PAGE>

                                       2

     technical or other nature, that derives actual or potential value from not
     being generally known, or readily ascertainable.

6)   I shall keep on the Company's premises (except when required elsewhere in
     connection with the conduct of the Company's business) and shall deliver to
     the Company upon termination of my employment, all things including models,
     circuits, instructions, drawings, notes, files, memoranda or other
     writings, software programs in source code or object code form, and
     magnetically or electronically stored information, which embody or contain
     any of the rights or information described in paragraphs 2 and 4 above. I
     further agree not to make or retain any copy, duplication, facsimile,
     reproduction or replication of the foregoing.

7)   This Agreement shall supersede any and all previous oral or written
     communications, discussions or agreements between me and the Company
     relating to the general subject matter addressed herein.

8)   I shall at any time during and subsequent to my employment with the Company
     reaffirm this Agreement or execute such further or other agreements with
     respect to the general subject matter addressed herein as the Company, or
     an affiliate company may from time to time require.

9)   In the event that my employment by the Company is succeeded by employment
     with an affiliate company, the terms of this Agreement apply until an
     agreement relating to this subject matter is signed with the affiliate
     company, and if I do not execute an agreement with such affiliate company
     relating to this subject matter, terms identical to those set forth in this
     Agreement shall apply immediately in favour of such affiliate company upon
     commencement of my employment and until such agreement is executed with
     such affiliate company.

Agreed this 11th day of October ____, 1999.

/s/ David L. Thompson                        /s/ David L. Thompson
--------------------------------             --------------------------------
Employee name (print)                        Employee signature

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