Document:

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                                SERVICE AGREEMENT

             THIS AGREEMENT made and entered into as of May 1, 1999;

BETWEEN:

                              DR. SCOTT A. VANSTONE
                              10140 Pineview Trail
                                  P.O. Box 490
                             Campbellville, Ontario
                                     LOP 1B0
                           (the "Chief Cryptographer")

                                                               OF THE FIRST PART

                                     -and-

                                 CERTICOM CORP.
                     200 Matheson Boulevard West, Suite 200
                          Mississauga, Ontario L5R 3L7
                               (the "Corporation")

                                                              OF THE SECOND PART

THIS AGREEMENT  WITNESSES that in  consideration of the covenants and agreements
herein contained the parties hereto agree as follows:

1.       Services

1.1      Description

          (a)      The Chief Cryptographer will provide the following services:

                   (i)     provision  of and  responsibility  for  research  and
                           development,   in  the   leadership   role  of  Chief
                           Cryptographer,   of  cryptographic   and  information
                           security   systems  on  an  exclusive  basis  to  the
                           Corporation;

                   (ii)    provision  of  technical  support for  marketing  and
                           strategy development;

                   (iii)   provision of product development support;

                   (iv)    the  overseeing  and  training  of the  Corporation's
                           cryptographers;

                   (v)     the identification of strategic intellectual property
                           initiatives;

                                       -1-

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                   (vi)    provision of support for patent activity;

                   (vii)   responsibility for providing research and development
                           of   the    Corporation's    products   relating   to
                           cryptographic and security information systems; and

                   (viii)  such  other  services  as are  mutually  agreed  upon
                           between the Chief  Cryptographer  and the Corporation
                           from time to time.

          (b)      The Chief  Cryptographer  shall commit himself on a full-time
                   basis and provide  active service in person at the offices of
                   the  Corporation  or  such  other  appropriate  site  as  the
                   Corporation  may agree to for an  average  three (3) days per
                   week. At all times, the Chief Cryptographer will use his best
                   efforts  to  respond in a  reasonably  timely  fashion to all
                   e-mail and voicemail  messages relating to the services to be
                   provided by him under this Agreement.

          (c)      The parties  agree that they will discuss and mutually  agree
                   upon the extent of the Chief  Cryptographer's  involvement in
                   such  other  activities  and his  time  commitments  relating
                   thereto.

          (d)      Subject to shareholder approval,  the Chief Cryptographer may
                   be  appointed  as a  member  of the  Corporation's  board  of
                   directors  during  the  term of  this  Agreement  or,  in the
                   alternative,  may attend  meetings of such board of directors
                   as an observer.

1.2       Term and termination

          Unless  otherwise  terminated as provided for in this Agreement,  this
Agreement shall be for a term of five (5) years,  and may be renewed upon mutual
written consent of the parties for successive additional periods of one (1) year
each.  This  Agreement may be terminated by either party upon receipt of written
notice at least  ninety (90) days in advance of the annual  anniversary  date of
this Agreement.  Further, if either party is in breach of any of its obligations
under this  Agreement,  the other party may give notice in writing of the breach
to the  defaulting  party and request the latter to remedy such  breach.  If the
party in breach  fails to remedy the breach  within  thirty  (30) days after the
date of written  notice,  then the Agreement may be  terminated  immediately  by
written notice of termination given by the complaining party.

1.3       Non-Competition

          The Chief Cryptographer agrees that during the term of this Agreement,
and for twelve (12) months following the termination of this Agreement,  without
the prior written approval of the Chief Financial Officer of the Corporation, he
will not become  engaged,  directly or  indirectly  as an employee,  consultant,
partner,  principal,  agent,  proprietor,  shareholder  (other than a holding of
shares  listed on a stock  exchange  that does not exceed 2% of the  outstanding
shares so listed) or advisor, in a business in

                                       -2-

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          (a)      Canada;

          (b)      the United States; or

          (c)      anywhere else in the world where the Corporation  markets its
                   products or services during the term of this Agreement;

                   that

          (i)      develops or markets  software  competitive  with the software
                   owned or marketed by the Corporation, or

          (ii)     provides   consulting,   maintenance,   support  or  training
                   services   that  are   competitive   with   the   consulting,
                   maintenance,  support or  training  services  provided by the
                   Corporation,

provided if, with respect to the period after the termination of this Agreement,
such business has two or more  divisions  located at different  addresses,  then
this Section 1.3 will not prohibit the Chief Cryptographer from becoming engaged
in a division that neither  develops nor markets  software  competitive with the
software  owned or marketed by the  Corporation  nor provides  services that are
competitive with the services provided by the Corporation (provided further that
in such case all the other  obligations  of this  Agreement  shall  continue  to
apply). The Corporation recognizes that the Chief Cryptographer is the owner and
principal  of  SVI  Consulting  Inc.  and  that  the  corporation  excludes  SVI
Consulting Inc. from the terms of this non-compete clause.
                                                                            SAV.

2.        Remuneration

2.1       Fees

          The Corporation  shall pay to the Chief  Cryptographer  an amount that
will provide him with total annual  compensation  including  all amounts paid to
the Chief  Cryptographer  by the University of Waterloo,  other than  publishing
royalties, as follows:

   May 1, 1999 - April 30, 2000               $275,000.00;
   May 1, 2000 - April 30, 2001               $300,000.00;
   May 1, 2001 - April 30, 2002               $325,000.00;
   May 1, 2002 - April 30, 2003               $350,000.00;
   May 1, 2003 - April 30, 2004               $375,000.00.

Such amounts will be paid monthly in advance.

2.2       Compensation Disclosure

          The Chief  Cryptographer  will provide the  Corporation  with full and
timely  disclosure of his compensation  from the University of Waterloo in order
that the fees to be paid as outlined in Section 2.1 above may be calculated.

                                       -3-

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2.3       Stock Options

          During the term of this Agreement,  the Chief  Cryptographer  shall be
entitled to participate in the Corporation's 1997 Stock Option Plan ("1997 SOP")
and any additional stock option plans or stock purchase plans established by the
Corporation.  The grant of any options or other  benefits under such plans shall
be in the discretion of the Corporation,  however, the Corporation  acknowledges
that the contribution of each of the Chief  Cryptographer  and Philip C. Deck is
fundamental  to the success of the  Corporation  and  declares  that  subject to
satisfactory  performance,  it is the intention of the  Corporation to treat the
Chief Cryptographer and Philip C. Deck similarly under the foregoing plans.

2.4       Auto Allowance

          In  addition  to the  amounts  outlined  in  section  2.1,  the  Chief
Cryptographer will receive a monthly auto allowance in the amount of $800.

2.5       Expenses

          The Chief  Cryptographer shall be reimbursed at the Corporation's cost
for all authorized  travelling  and other  out-of-pocket  expenses  actually and
properly incurred by him in connection with his duties  hereunder.  For all such
expenses the Chief Cryptographer shall furnish to the Corporation statements and
vouchers as and when required by the Corporation.

2.6       Issuance of Shares

          In  the  event  of  a  take-over  bid,  an  amalgamation,  a  plan  of
arrangement or other form of business  transaction  pursuant to which holders of
Common  Shares  cease  to own at  least  33% of  the  voting  securities  of the
Corporation   or  surviving   entity   resulting  from  such   transaction   (an
"Acquisition"),  the Corporation  will issue to the Chief  Cryptographer  50,000
Common Shares. Such shares, if issued to the Chief  Cryptographer,  will vest as
to 16,667 of such shares on the first  anniversary  following the  completion of
the  Acquisition  and a further  16,666 of such shares on each of the second and
third  anniversary of the  completion of the  Acquisition.  Notwithstanding  the
foregoing,  in the event that this  Agreement is terminated  by the  Corporation
subsequent  to the  completion  of the  Acquisition,  then all of the  foregoing
shares that have not yet vested will vest  immediately  upon the  termination of
this Agreement.

 3.       Proprietary Rights Agreement

          The Chief  Cryptographer  confirms he has executed and is bound by the
Proprietary  Rights  Agreement   attached  hereto.  The  Chief   Cryptographer's
obligations  under such Proprietary  Rights Agreement shall continue both before
and after he has used any  Confidential  Information  for the  purposes  of such
Proprietary Rights Agreement and both before and after the services of the Chief
Cryptographer  with the Corporation cease, and shall continue until such time as
the Chief  Cryptographer  is expressly released  therefrom by the Corporation in
writing.  The obligations of the Chief  Cryptographer under this Agreement shall
be binding on the executors, administrators or other legal representatives

                                       -4-

<PAGE>

of the  Chief  Cryptographer.  Any  breach  by the  Chief  Cryptographer of this
Agreement or the above  Proprietary  Rights  Agreement  shall cause  irreparable
damage to the  Corporation  and any such breach shall entitle the Corporation to
immediate injunctive relief from a court of competent jurisdiction.

4.        Confidentiality

          All confidential  data and information  concerning the Corporation and
obtained by the Chief Cryptographer during the performance of his services under
this Agreement shall be maintained confidential by the Chief Cryptographer.

5.        Exclusive Contract

          Subject to what is hereinafter stated, the Chief Cryptographer  agrees
that it is a condition of the  Corporation  utilizing  the services of the Chief
Cryptographer,  that the Chief  Cryptographer shall not provide similar services
to any other person,  other than the performance of his duties as a Professor at
the University of Waterloo.  For the purposes of clarity,  it is agreed that the
Chief Cryptographer shall not provide services directly or indirectly during the
term of this Agreement to a competitor of the  Corporation in the  cryptographic
or information security systems fields or in any closely related field of study.
The Corporation  shall be entitled to retain the services of any persons without
restriction during the term of this Agreement.

6.        Assignment

          Neither this  Agreement nor any interest may be assigned in any manner
by either party.

7.        Entire Agreement

          This Agreement  constitutes the entire  agreement  between the parties
with respect to the subject  matter hereof and cancels and  supersedes any prior
understandings  and agreements  between the parties hereto with respect thereto.
There are no representations,  warranties,  forms,  conditions,  undertakings or
collateral agreements,  express,  implied or statutory between the parties other
than as expressly set forth in this Agreement.

8.        Governing Law

          This Agreement  shall be governed by and construed in accordance  with
the laws of the Province of Ontario and the laws of Canada applicable therein.

                                       -5-

<PAGE>

          IN WITNESS WHEREOF the parties have executed this Agreement.

                                 )
/s/ Bruce MacInnis               )         /s/ Scott A. Vanstone
---------------------------------)         -------------------------------------
Witness                          )         Dr. Scott A. Vanstone
Name: Bruce MacInnis             )
Address: 1513 Sturgeon Court     )
         Pickering, ON           )
         L1V 5P6                 )

                                           CERTICOM CORP.

                                           By: /s/ Philip C. Deck
                                              ----------------------------------
                                                   Philip C. Deck
                                                   Chief Executive Officer

                                       -6-EMPLOYMENT AGREEMENT

         This  employment  Agreement  is  effective  as of February 7, 2000 (the
"Effective Date") between Certicom Corp., a Delaware  corporation  ("Certicom"),
Certicom Corp., a Yukon Territory,  Canada corporation ("Parent") and Richard D.
Brounstein ("Employee").

         In  consideration  of  the  mutual  promises  and  conditions  in  this
Employment  Agreement,  and all  benefits  associated  with  the  employment  of
Employee, it is agreed as follows:

                           ARTICLE 0NE -- EMPLOYMENT

1.1 Employment

         Commencing  February 7, 2000,  Certicom  shall  employ  Employee as its
Finance  Director  and  commencing  February  23,  2000,  Certicom  shall employ
Employee as its Senior  Vice  President  Finance,  Chief  Financial  Officer and
Secretary.  Employee  shall perform such duties and exercise such powers related
to such  offices as set forth in the bylaws of  Certicom  and as  prescribed  or
specified by the Board of Directors of Certicom,  subject  always to the control
and direction of such board of Directors. From February 23, 2000, Employee shall
also serve as the Senior Vice President  Finance,  Chief  Financial  Officer and
Secretary  of Parent and each  direct or indirect  wholly  owned  subsidiary  of
Parent  (such  subsidiaries,  Parent and  Certicom  collectively  the  "Certicom
Group").

                          ARTICLE TWO -- REMUNERATION

2.1 Salary

         As compensation for the services by Employee hereunder,  Certicom shall
pay  Employee  during  the  term of this  Agreement  a gross  annual  salary  of
one-hundred   seventy-five  thousand  dollars  ($175,000.00),   payable  on  the
fifteenth and the last day of each calendar month.

2.2 Certicom Bonus

         Each  quarter,  Employee  shall be eligible to receive a bonus  payment
equivalent to up to 2.5% ($4,375.00) of his annual salary from Certicom based on
Parent achieving its quarterly  financial  targets,  as determined by the CEO of
Parent.

2.3 Annual Bonus

         In its sole and  absolute  discretion,  Certicom  may pay  Employee  an
additional  cash  bonus  at the end of each  fiscal  year  of  Parent.  Employee
acknowledges  that  the  payment  of any  such  bonus  shall  be in the sole and
absolute discretion of the Board of Directors of Parent.

                                      -1-

<PAGE>

2.4 Options

         (a)      Employee  shall be entitled to  participate  in Parent's  1997
                  Stock Option Plan  ("SOP"),  and any  additional  stock option
                  plans or stock purchase plans as may be established by Parent.
                  As of the date of this  Agreement,  Employee  shall be granted
                  options to purchase  one-hundred  fifteen  thousand  (115,000)
                  Parent  common  shares  under  the  SOP at an  exercise  price
                  equivalent  to the closing  price of the shares on the trading
                  day prior to the Effective Date of this  Agreement.  The grant
                  of any future  options or any benefits  under such plans shall
                  be in the discretion of Certicom.

         (b)      In the event there is a Change of Control  (as defined  below)
                  of Parent and Employee is subsequently  terminated by Certicom
                  or  Parent  without  Cause (as  defined  below),  or  Employee
                  resigns his  employment  with Good Reason (as defined  below),
                  then 50% of any  unvested  options or other  rights to acquire
                  securities of Parent,  whether  granted prior to or subsequent
                  to the date hereof, including,  without limitation, 50% of any
                  such unvested  options or rights granted  pursuant to the SOP,
                  shall immediately vest and become fully exercisable.

         For the purposes of this Agreement, "Change of Control" shall be deemed
to have  occurred if: (1) any person  (including a "person" as such term is used
in Sections 13(d) and 14(d) of the  Securities  Exchange Act of 1934, as amended
(the "Exchange  Act")),  other than persons  controlling (as defined in Rule 405
under the Securities Act of 1933 ("Rule 405")),  Parent as of the Effective Date
of this Agreement (except that no person shall be deemed to control Parent under
Rule 405 merely due to his or her position as an officer or director of Parent),
(A) becomes the "beneficial  owner" (as defined in Rule 13d-3 under the Exchange
Act),  directly  or  indirectly,  of more than 50% of the voting  securities  of
Parent,  or (B)  succeeds  to the  control  of all or  substantially  all of the
business or assets of Parent through merger, transfer of assets, reorganization,
or other event;  or (2)  individuals who as of the Effective Date constitute the
Board of  Directors  cease for any  reason  to  constitute  at least a  majority
thereof,  unless the election,  or the  nomination  for election,  by the Parent
stockholders,  of each new Board  member was approved by a majority of the Board
members then still in office who were Board members as of the Effective Date.

         For the purposes of this  Agreement,  "Cause" shall mean written notice
to Employee that he has engaged in any one or more of the following;

                  (1)      Gross    dishonesty,     fraud,     misappropriation,
                           embezzlement,  or other  act of  material  misconduct
                           against any entity in the Certicom Group;

                                      -2-

<PAGE>

                  (2)      Conviction  of any criminal act  involving a crime of
                           moral  turpitude  or  a  felony  including,   without
                           limitation,  misappropriation of funds,  property, or
                           trade secrets;

                  (3)      Willful  and  knowing   violation  of  any  rules  or
                           regulations of any  governmental  or regulatory  body
                           which are  material to the  business of any entity in
                           the Certicom Group;

                  (4)      Violation of policies,  rules or  regulations  of any
                           entity  in the  Certicom  Group  which  violation  is
                           materially detrimental to such entity;

                  (5)      A material  breach,  a material  repudiation or other
                           material failure to comply with or perform any of the
                           material  terms  of  this  Agreement,  including  the
                           attached Confidentiality and Rights Agreement; or

                  (6)      A good faith  determination by the Board of Directors
                           of Parent based on objective evidence that persistent
                           use of drugs or alcohol is significantly  interfering
                           with Employee's performance of his duties hereunder.

         For the purposes of this  Agreement,  "Good  Reason" shall be deemed to
exist  where  following  a Change of Control;  (1) Parent  materially  alters or
reduces employee's duties, responsibilities, authority or base compensation from
those in effect  immediately  prior to the  occurrence  of a Change  of  Control
(including  an  alteration  or  reduction  indirectly  in the  form of  resource
allocation or other  assignment);  (2) parent  materially  breaches the terms of
this Agreement or any other  agreement  between Parent and Employee with respect
to the payment or vesting of  compensation  or benefits or in any other material
respect  and such  breach is not cured  within  thirty  (30) days  after  Parent
receives written notice thereof; (3) Parent requires Employee, as a condition of
employee's  continued  employment,  to be based in any location  more than fifty
miles from the City of Hayward,  California,  or to spend more than  twenty-five
percent of each calendar quarter  traveling  outside the San Francisco Bay Area;
or  (4)  Parent  requires  Employee,  as a  condition  of  Employee's  continued
employment, to perform illegal or fraudulent acts or omissions.

                                      -3-

<PAGE>

2.5 Benefits

         Employee will be entitled to participate  in all of Certicom's  benefit
plans generally  available to its senior executive  employees,  as determined by
Certicom in its discretion, in accordance with the terms thereof.

2.6 Vacation

         Employee  shall be entitled to accrue fifteen (15) days of vacation per
year during the first through  fifth years of employment  which will be prorated
for the first year of this Agreement.  After five years of employment,  Employee
shall be entitled to accrue twenty (20) days of vacation per year.

2.7 Expenses

         Employee shall be reimbursed at the Employee's  cost for all authorized
travel and other out of pocket expenses actually and properly incurred by him in
connection  with his duties  hereunder.  For all such  expenses,  Employee shall
furnish to Certicom  statements  and vouchers as and when  required by Certicom.
Also,  Certicom shall  reimburse  Employee  reasonable and actual  out-of-pocket
expenses for Employee's  legal counsel to review this Agreement in an amount not
to exceed three thousand five hundred dollars ($3,500.00).

                     ARTICLE THREE -- EMPLOYEE'S COVENANTS

 3.1 Service

         During his  employment,  Employee  shall  devote such time,  attention,
energies,  interests, and abilities for the business of the Certicom Group as is
necessary to fulfill his  responsibilities,  shall well and faithfully serve the
Certicom  Group,  and shall use his best efforts to promote the interests of the
Certicom Group. Employee shall not engage in any business activity that would be
adverse to the Certicom Group or its business prospects, financial or otherwise.

3.2 Duties and Responsibilities

         Employee shall duly and diligently  perform all the duties  assigned to
him while in the employ of Certicom,  and shall truly and faithfully account for
and deliver to Certicom all money,  securities and things of value  belonging to
any entity in the Certicom Group which Employee may, from time to time,  receive
for, from or on account of any entity in the Certicom Group.

3.3 Rules and Regulations

         Employees shall be bound by and shall  faithfully  observe and abide by
all the rules,  regulations,  or policies  that  Certicom  may  institute at its
discretion from time to time which are

                                      -4-

<PAGE>

brought to Employee's notice or of which he should reasonably be aware.

3.4 Confidentiality and Rights Agreement

         Employee  will  execute  and  deliver  the  Confidentiality  and Rights
Agreement  in  the  form  attached  hereto  as  Exhibit  A.  The  terms  of  the
Confidentiality  and Rights  Agreement are  incorporated  herein as if fully set
forth.  Employee's  obligations under such  Confidentiality and Rights Agreement
shall  continue both before and after he has used any  confidential  information
for the purposes of such  Confidentiality and Rights Agreement,  and both before
and after the  employment of Employee with Certicom  ceases,  and shall continue
until such time as  Employee  is  expressly  released  therefrom  by Certicom in
writing.  The  obligations of Employee under this Agreement  shall be binding on
the assigns, executors, administrators or legal representatives of Employee. Any
breach by the  employee  of this  Agreement  or the  Confidentiality  and Rights
Agreement shall cause irreparable damage to Certicom,  and any such breach shall
entitled Certicom to seek immediate  injunctive relief from a court of competent
jurisdiction.

3.5 Agreement to Arbitrate

         Employee  will  execute and deliver the Mutual  Agreement  to Arbitrate
Claims  in the form  attached  hereto  as  Exhibit  B. The  terms of the  Mutual
Agreement to Arbitrate Claims are incorporated herein as if fully set forth.

                   ARTICLE FOUR -- TERMINATION OF EMPLOYMENT

4.1 At-Will Employment

         Employee's  employment may be terminated by either mutual  agreement of
the parties,  Employee's  election,  or  Certicom's  election.  Either party may
terminate  Employee's  employment  for any  reason,  or for no  reason,  with or
without Cause, and at any time, in their sole and absolute discretion;  provided
only that if Certicom terminates Employee's employment without Cause (as defined
in section  2.4)  whether or not  following  a Change of Control or if  Employee
resigns  with Good  Reason (as  defined in section  2.4)  following  a Change of
Control (as defined in section 2.4), it shall pay Employee severance as follows:

                  (a)      a lump sum  payment  equivalent  to  Employee's  base
                           salary for a total period of nine (9) months; and

                  (b)      continuation of Employee's health insurance  benefits
                           for a total period of nine (9) months; and

                                       -5-
<PAGE>

                  (c)      Nine  (9)  months  acceleration  of  vesting  of  all
                           unvested  stock  options and other  rights to acquire
                           securities  held by  Employee  as of the  termination
                           date; and

                  (d)      Up  to   ten   thousand   dollars   ($10,000.00)   in
                           outplacement services.

4.2 Termination by Certicom for Cause

         Certicom may terminate this Agreement at any time for Cause (as defined
in paragraph  2.4(b)) without payment of any compensation of any kind or nature,
including but not limited to severance,  anticipated  earnings, or stock options
or other securities of any kind.

4.3 Return of Property

         Upon any termination of this Agreement,  Employee shall at once deliver
or cause to be delivered  to Certicom,  all books,  documents,  effects,  money,
securities or other property  belonging to any entity in the Certicom  Group, or
for which  Certicom is liable to others,  which are in the  possession,  charge,
control or custody of Employee.

4.4 Provisions Which Will Operate Following Termination

         Notwithstanding  any  termination  of this  Agreement  for  any  reason
whatsoever,  the  provisions  of sections 3.4 and 4.3 of this  Agreement and any
other  provisions  of this  Agreement  necessary to give effect  thereto,  shall
continue in full force and effect following such termination.

4.5 Indemnity

         Certicom shall  indemnify  Employee to the fullest extent  permitted by
applicable law at California Labor Code section 2802.

                            ARTICLE FIVE -- GENERAL

5.1 Sections and Headings

         The  division of this  Agreement  into  Articles  and  Sections and the
insertion of headings are for the  convenience  of reference  only and shall not
effect the  construction or  interpretation  of this  Agreement.  The term "this
Agreement",   "hereof",  "hereunder"  and  similar  expressions  refer  to  this
Agreement and not to any  particular  article,  section or other portion of this
Agreement.

                                      -6-
<PAGE>

5.5 Benefit of Agreement

         This   Agreement   shall   bind   the   Employee's   heirs,    personal
representatives,  legal  representatives,  successors,  spouses and assigns, and
shall bind Certicom and Parent, and their successors,  purchasers,  assignees or
any entities who acquire the assets of Certicom and/or Parent.

5.3 Entire Agreement

         This Agreement,  including the  Confidentiality and Rights Agreement at
Exhibit A, the Mutual  Agreement to Arbitrate Claims at Exhibit B, and any stock
option  agreement  entered  into between the parties in relation to the grant of
stock options  referred to in Section 2.4(a),  constitutes the entire  Agreement
between the parties with respect to the subject matter hereof,  and replaces and
supercedes any prior understanding and agreements between the parties.

5.4 Amendments and Waivers

         No amendment  to this  Agreement  shall be valid or binding  unless set
forth in writing and duly executed by Employee and the Chief  Executive  Officer
of Certicom. No waiver of any breach of any provision of this Agreement shall be
effective or binding  unless made in writing and signed by the party  purporting
to give the same and, unless otherwise provided in the written waiver,  shall be
limited to the specific breach waived.

5.5 Severability

         If any  provision  of this  Agreement  is  determined  to be invalid or
unenforceable  in whole or in part,  such invalidity or  unenforceability  shall
attach only to such  provision or part thereof,  and the remaining  part of such
provision  and all other  provisions  hereof  shall  continue  in full force and
effect.

5.6 Notices

         Any demand,  notice or other  communication  to be given in  connection
with  this  Agreement  shall be given in  writing  and may be given by  personal
delivery, by fax or by registered mail addressed to the recipient as follows:

               To the Employee:    Richard D. Brounstein
                                   606 Bella Vista Court
                                   Fremont, CA  94539

                                      -7-
<PAGE>

               To the Employer:    Certicom Corp.
                                   Attention: Mr. Richard P. Dalmazzi
                                   25801 Industrial Boulevard
                                   Hayward, CA  94545

or such other  address or  individual  as may be  designated by notice by either
party to the other.

         Any  communication  given by personal  delivery  shall be  conclusively
deemed to have been given on the day of actual delivery  thereof;  or if made or
given by facsimile, on the business day following receipt thereof; or if made or
given by  registered  mail,  on the 7th day,  other than a  Saturday,  Sunday or
statutory holiday in California, following the deposit thereof in the mail.

         If the party giving any communication knows or ought reasonably to know
of any  difficulties  with the postal  system which might affect the delivery of
mail, any such communication shall not be mailed but shall be given by facsimile
or personal delivery.

5.7 Governing Law

         This  Agreement  shall be deemed to have been entered into and shall be
construed and enforced in accordance with the laws of the State of California as
applied to contracts made and to be performed within California.

5.8 Reasonableness

         Employee  declares  that he has read the  foregoing  and  agrees to the
conditions and obligations  set forth.  Employee also  acknowledges  that he has
been  given a  reasonable  amount  of time in which  to  consult  with,  and has
consulted with, an attorney with respect to this Agreement.

5.9 Copy of Agreement

         Employee  acknowledges  receipt of a copy of this Agreement duly signed
by Employee and Certicom.

Dated:  February 7, 2000           /s/ Richard D. Brounstein
      ------------------------     ---------------------------------
                                   Richard D. Brounstein (Employee)

Dated:  February 7, 2000           /s/ Richard M. Depew
      ------------------------     ---------------------------------
                                   Witness to Employee Signature

                                   Richard M. Depew
                                   ---------------------------------
                                   Printed Witness' Name and Address

                                      -8-

<PAGE>

                                   Certicom Corp.

Dated:  February 7, 2000           by: /s/ Richard P. Dalmazzi
      ------------------------         -----------------------------
                                            Richard P. Dalmazzi
                                          Chief Executive Officer

                                      -9-

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