Document:

<PAGE>   1

                                                                   EXHIBIT 10.64

                                                 March 9, 2000

Arthur A. Siciliano, Ph.D.
3 Pavia Place
Framingham, MA   01701

                      Re: AMENDMENT OF EMPLOYMENT AGREEMENT
Dear Art,

This letter agreement serves to further amend the employment agreement dated as
of May 16, 1990, by and between you and PolyMedica Industries, Inc. (the
"Company"), as amended by certain letter agreements dated as of June 1, 1991;
December 5, 1991; March 18, 1993; March 31, 1994; April 11, 1995; April 3, 1996;
July 1, 1997; July 1, 1998; September 22, 1998; and June 14, 1999 (together, the
"Employment Agreement").

         SALARY. The Base Salary, as defined in Section 3.1. of the Employment
         Agreement, shall be increased to $330,000 effective April 1, 2000.

If the foregoing is acceptable to you, please indicate your agreement by signing
a copy of this letter agreement and returning it to the undersigned.

                                            Very truly yours,

                                            /s/ Steven J. Lee

                                            Steven J. Lee
                                            Chairman and Chief Executive Officer

ACCEPTED AND AGREED TO:

/s/ Arthur A. Siciliano. Ph.D
------------------------------
Arthur A. Siciliano, Ph.D
President; President, PolyMedica Pharmaceuticals (U.S.A.), Inc.<PAGE>   1

                                                                   EXHIBIT 10.65

                                                 March 9, 2000

Mr. Eric G. Walters
167 Monument Street
Concord, MA   01742

                      Re: AMENDMENT OF EMPLOYMENT AGREEMENT
Dear Eric,

This letter agreement serves to further amend the employment agreement dated as
of June 1, 1991, by and between you and PolyMedica Industries, Inc. (the
"Company"), as amended by certain letter agreements dated as of December 5,
1991; March 18, 1993; March 31, 1994; April 11, 1995; April 3, 1996; July 1,
1997; July 1, 1998; September 22, 1998; and June 14, 1999 (together, the
"Employment Agreement").

         SALARY. The Base Salary, as defined in Section 3.1. of the Employment
         Agreement, shall be increased to $210,000 effective April 1, 2000.

If the foregoing is acceptable to you, please indicate your agreement by signing
a copy of this letter agreement and returning it to the undersigned.

                                            Very truly yours,

                                            /s/ Steven J. Lee

                                            Steven J. Lee
                                            Chairman and Chief Executive Officer

ACCEPTED AND AGREED TO:

/s/ Eric G. Walters
------------------------------
Eric G. Walters
Chief Financial Officer and Clerk<PAGE>   1

                                                                     EXHIBIT 4.2

                            CERTIFICATE OF AMENDMENT

                                     OF THE

                      RESTATED CERTIFICATE OF INCORPORATION

                                       OF

                   FAIRCHILD SEMICONDUCTOR INTERNATIONAL, INC.

                     --------------------------------------

                  Fairchild Semiconductor International, Inc., a corporation
organized and existing under and by virtue of the General Corporation Law of the
State of Delaware (the "Company"), does hereby certify:

         FIRST: That by the unanimous written consent of the board of directors
         of the Company, dated March 17, 2000, resolutions were duly adopted
         setting forth a proposed amendment to the Restated Certificate of
         Incorporation of the Company, declaring said amendment to be advisable
         and calling for consideration of said proposed amendment by the
         stockholders of the Company. The resolution setting forth the proposed
         amendment is as follows:

                                    RESOLVED, that the Restated Certificate of
                  Incorporation of the Company be amended to increase the number
                  of authorized shares of Class A Common Stock, par value $.01
                  per share, of the Company to 140,000,000 from 110,000,000, and
                  to increase the number of authorized shares of Class B Common
                  Stock, par value $.01 per share, of the Company to 140,000,000
                  from 110,000,000, so that, accordingly, Section 5 of the
                  Restated Certificate of Incorporation reads in its entirety as
                  follows:

                           5. AUTHORIZED CAPITAL. The aggregate number of shares
                           of stock which the Corporation shall have authority
                           to issue is 280,100,000 shares, divided into three
                           classes consisting of 100,000 shares of Preferred
                           Stock, par value $.01 per share ("Preferred Stock");
                           140,000,000 shares of Class A Common Stock, par value
                           $.01 per share ("Class A Common Stock"); and
                           140,000,000 shares of Class B Common Stock, par value
                           $.01 per share ("Class B Common Stock"). Class A
                           Common Stock and Class B Common Stock are hereinafter
                           sometimes individually or collectively referred to as
                           "Common Stock."

         SECOND: That thereafter, pursuant to the resolution of the board of
         directors, the proposed amendment was duly approved by the stockholders
         of the Company's Class A Common Stock at the Company's Annual Meeting
         of Stockholders on May 16, 2000, and, by written consent dated May 16,
         2000, by the sole stockholder of the Company's Class B Common Stock.

<PAGE>   2

         THIRD: That said amendment was duly adopted in accordance with the
         provisions of Sections 242, 222 and 228 of the General Corporation Law
         of the State of Delaware.

                  IN WITNESS WHEREOF, the Company has caused this Certificate to
         be executed by Daniel E. Boxer, its Executive Vice President and
         Secretary, this 16th day of May, 2000.

                                     By: /s/ Daniel E. Boxer
                                         --------------------------------------
                                         Daniel E. Boxer
                                         Executive Vice President and Secretary<PAGE>   1

                              EMPLOYMENT AGREEMENT
                              --------------------

         This Employment Agreement ("Agreement") is made and entered into on
this ___ day of ____________, 2000, effective as of the date set forth in
paragraph 2.1 below, and is by and between Terremark Worldwide, Inc., a Delaware
corporation (the "Company"), and ___________ (hereinafter called the
"Executive").

                                 R E C I T A L S
                                 - - - - - - - -

A. The Executive possesses knowledge and skills which the Company believes will
be of substantial benefit to its operations and success, and the Company desires
to employ the Executive on the terms and conditions set forth below.

B. The Executive is willing to make his services available to the Company on the
terms and conditions set forth below.

                                    AGREEMENT
                                    ---------

         NOW, THEREFORE, in consideration of the premises and mutual covenants
set forth herein, the parties agree as follows:

         1.       EMPLOYMENT.
                  -----------

                  1.1 EMPLOYMENT AND TERM. The Company hereby agrees to employ
the Executive and the Executive hereby agrees to serve the Company on the terms
and conditions set forth herein.

                  1.2 DUTIES OF EXECUTIVE. During the Term of Employment under
this Agreement, the Executive shall serve as the __________ of the Company,
shall diligently perform all services as may be assigned to him by the Board
(provided that, such services shall not materially differ from the services
currently provided by the Executive), and shall exercise such power and
authority as may from time to time be delegated to him by the Board. The
Executive shall devote his full time and attention to the business and affairs
of the Company, render such services to the best of his ability, and use his
best efforts to promote the interests of the Company. It shall not be a
violation of this Agreement for the Executive to (i) serve on corporate, civic
or charitable boards or committees, (ii) deliver lectures, fulfill speaking
engagements or teach at educational institutions, or (iii) manage personal
investments, so long as such activities do not significantly interfere with the
performance of the Executive's responsibilities to the Company in accordance
with this Agreement.

         2.       TERM.
                  -----

                  2.1 INITIAL TERM. The initial Term of Employment under this
Agreement, and the employment of the Executive hereunder, shall commence on the
date on which the pending merger of the Company into AmTec, Inc. becomes
effective (the "Commencement Date") and shall expire on the date that is twelve
months after the Commencement Date, unless sooner terminated in accordance with
Section 5 hereof (the "Initial Term"). In the event the merger of the Company
into AmTec, Inc. has not closed by December 31, 2000, the Agreement shall be
void.

<PAGE>   2

                  2.2 RENEWAL TERMS. At the end of the Initial Term, the Term of
Employment automatically shall renew for successive one year terms (subject to
earlier termination as provided in Section 5 hereof), unless the Company or the
Executive delivers written notice to the other at least one month prior to the
Expiration Date of its or his election not to renew the Term of Employment.

                  2.3 TERM OF EMPLOYMENT AND EXPIRATION DATE. The period during
which the Executive shall be employed by the Company pursuant to the terms of
this Agreement is sometimes referred to in this Agreement as the "Term of
Employment", and the date on which the Term of Employment shall expire
(including the date on which any renewal term shall expire), is sometimes
referred to in this Agreement as the "Expiration Date".

         3.       COMPENSATION.
                  -------------

                  3.1 BASE SALARY. The Executive shall receive a base salary at
the annual rate of $__________ (the "Base Salary") during the Term of
Employment, with such Base Salary payable in installments consistent with the
Company's normal payroll schedule, subject to applicable withholding and other
taxes. The Base Salary shall be reviewed, at least annually, for merit increases
and may, by action and in the sole discretion of the Board, be increased at any
time or from time to time.

                  3.2 BONUSES. During the Term of Employment, the Executive
shall be eligible to receive bonuses in such amounts and at such times as the
Board shall determine in its sole discretion.

         4.       EXPENSE REIMBURSEMENT AND OTHER BENEFITS.
                  -----------------------------------------

                  4.1 REIMBURSEMENT OF EXPENSES. Upon the submission of proper
substantiation by the Executive, and subject to such rules and guidelines as the
Company may from time to time adopt, the Company shall reimburse the Executive
for all reasonable expenses actually paid or incurred by the Executive during
the Term of Employment in the course of and pursuant to the business of the
Company. The Executive shall account to the Company in writing for all expenses
for which reimbursement is sought and shall supply to the Company copies of all
relevant invoices, receipts or other evidence reasonably requested by the
Company.

                  4.2 COMPENSATION/BENEFIT PROGRAMS. During the term of
Employment, the Executive shall be entitled to participate in all medical,
dental, hospitalization, accidental death and dismemberment, disability, travel
and life insurance plans, and any and all other plans as are presently and
hereinafter offered by the Company to its executives, including savings,
pension, profit-sharing and deferred compensation plans, subject to the general
eligibility and participation provisions set forth in such plans.

                  4.3 WORKING FACILITIES. During the Term of Employment, the
Company shall furnish the Executive with an office, secretarial help and such
other facilities and services suitable to his/her position and adequate for the
performance of his/her duties hereunder.

                  4.4 STOCK OPTIONS. During the Term of Employment, the
Executive shall be eligible to be granted options (the "Stock Options") to
purchase common stock (the "Common Stock") of the Company under (and therefore
subject to all terms and conditions of) the Company's 1996 Stock Option Plan, as
amended, and any successor plan thereto (the "Stock Option Plan") and all rules
of regulation of the Securities and Exchange Commission applicable to stock
option plans then in effect. The number of Stock Options and terms and
conditions of the Stock Options shall be determined by the Committee appointed
pursuant to the Stock Option Plan, or by the Board of Directors of the Company,
in its sole

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<PAGE>   3

discretion and pursuant to the Stock Option Plan. Notwithstanding the forgoing,
the Company agrees to request its Board of Directors, immediately upon closing
of the merger of the Company into AmTec, Inc. (thereby creating Terremark
Worldwide, Inc. or "TWW"), to issue to the Executive _____ options for TWW
common stock with a market strike price, vesting 1/3, 1/3, 1/3 after one year,
two years and three years, respectively. If the unlikely event the Board refuses
to do so, the Executive may, at his option, immediately terminate this Agreement
by written notice to the Company.

                  4.5 OTHER BENEFITS. The Executive shall be entitled to three
weeks of vacation each calendar year during the Term of Employment, to be taken
at such times as the Executive and the Company shall mutually determine and
provided that no vacation time shall interfere with the duties required to be
rendered by the Executive hereunder. Any vacation time not taken by Executive
during any calendar year may not be carried forward into any succeeding calendar
year. The Executive shall receive such additional benefits, if any, as the Board
of the Company shall from time to time determine.

         5.       TERMINATION.
                  ------------

                  5.1 TERMINATION FOR CAUSE. The Company shall at all times have
the right, upon written notice to the Executive, to terminate the Term of
Employment, for Cause. For purposes of this Agreement, the term "Cause" shall
mean (i) an action or omission of the Executive which constitutes a willful and
material breach of, or failure or refusal (other than by reason of his
disability) to perform his duties under, this Agreement which is not cured
within fifteen (15) days after receipt by the Executive of written notice of
same, (ii) fraud, embezzlement, misappropriation of funds or breach of trust in
connection with his services hereunder, (iii) conviction of a felony or any
other crime which involves dishonesty or a breach of trust, or (iv) gross
negligence in connection with the performance of the Executive's duties
hereunder, which is not cured within fifteen (15) days after written receipt by
the Executive of written notice of same. Any termination for Cause shall be made
in writing to the Executive, which notice shall set forth in detail all acts or
omissions upon which the Company is relying for such termination. The Executive
shall have the right to address the Board regarding the acts set forth in the
notice of termination. Upon any termination pursuant to this Section 5.1, the
Company shall only be obligated to pay to the Executive his Base Salary to the
date of termination. The Company shall have no further liability hereunder
(other than for reimbursement for reasonable business expenses incurred prior to
the date of termination, subject, however, to the provisions of Section 4.1.

                  5.2 DISABILITY. The Company shall at all times have the right,
upon written notice to the Executive, to terminate the Term of Employment, if
the Executive shall become entitled to benefits under the Company's group
disability policy or any individual disability policy then in effect, or, if the
Executive shall as the result of mental or physical incapacity, illness or
disability, become unable to perform his obligations hereunder for a period of
90 days in any 12-month period. The Company shall have sole discretion based
upon competent medical advice to determine whether the Executive continues to be
disabled. Upon any termination pursuant to this Section 5.2, the Company shall
(i) pay to the Executive any unpaid Base Salary through the effective date of
termination specified in such notice, (ii) pay to the Executive a severance
payment equal to one month of the Executive's Base Salary at the time of the
termination of the Executive's employment with the Company. The Company shall
have no further liability hereunder (other than for reimbursement for reasonable
business expenses incurred prior to the date of termination, subject, however to
the provisions of Section 4.1).

                  5.3 DEATH. Upon the death of the Executive during the Term of
Employment, the Company shall pay to the estate of the deceased Executive any
unpaid Base Salary through the Executive's date of death. The Company shall have
no further liability hereunder (other than for

                                      -3-
<PAGE>   4

reimbursement for reasonable business expenses incurred prior to the date of the
Executive's death, subject, however to the provisions of Section 4.1.

                  5.4 TERMINATION WITHOUT CAUSE. At any time the Company shall
have the right to terminate the Term of Employment by written notice to the
Executive. Upon any termination pursuant to this Section 5.4 (that is not a
termination under any of Sections 5.1, 5.2, 5.3, 5.5 or 5.6), the Company shall
(i) pay to the Executive any unpaid Base Salary through the effective date of
termination specified in such notice, (ii) continue to pay the Executive's Base
Salary for a period (the " Continuation Period") through the date on which the
Term of Employment would have ended pursuant to Section 2 hereof in the absence
of an earlier termination pursuant to this Section 5 but in no event for more
than six (6) months from notice of termination hereunder, (iii) continue to
provide the Executive with the benefits he/she was receiving under Sections 4.2
and 4.4 hereof (the "Benefits") through the end of the Continuation Period in
the manner and at such times as the Incentive Compensation or Benefits otherwise
would have been payable or provided to the Executive. In the event that the
Company is unable to provide the Executive with any Benefits required hereunder
by reason of the termination of the Executive's employment pursuant to this
Section 5.4, then the Company shall pay the Executive cash equal to the value of
the Benefit that otherwise would have accrued for the Executive's benefit under
the plan, for the period during which such Benefits could not be provided under
the plans. The Company's good faith determination of the amount that would have
been contributed or the value of any Benefits that would have accrued under any
plan shall be binding and conclusive on the Executive. For this purpose, the
Company may use as the value of any Benefit the cost to the Company of providing
that Benefit to the Executive. Further, the Executive shall continue to vest in
the Executive's Stock Options through the end of the Continuation Period in the
same manner and to the same extent as if his employment hereunder terminated on
the last day of the Continuation Period. The Company shall have no further
liability hereunder (other than for (x) reimbursement for reasonable business
expenses incurred prior to the date of termination, subject, however, to the
provisions of Section 4.1, and (y) payment of compensation for unused vacation
days that have accumulated during the calendar year in which such termination
occurs). For all purposes under this Agreement, the failure by Company to offer
to renew the Agreement following the expiration of the Initial Term or any
Renewal Term on the same terms and conditions hereunder shall be treated as if
the Company terminated this Agreement pursuant to this Section 5.4.

                  5.5      TERMINATION BY EXECUTIVE.
                           -------------------------

                           (a) The Executive shall at all times have the right,
upon sixty (60) days written notice to the Company, to terminate the Term of
Employment.

                           (b) Upon termination of the Term of Employment
pursuant to this Section 5.5 (that is not a termination under Section 5.6) by
the Executive without Good Reason, the Company shall pay to the Executive any
unpaid Base Salary through the effective date of termination specified in such
notice. The Company shall have no further liability hereunder (other than for
reimbursement for reasonable business expenses incurred prior to the date of
termination, subject, however, to the provisions of Section 4.1. At the
Company's sole option, upon receipt of notice from the Executive pursuant to
this Section, the Company may immediately terminate the Term of Employment, in
which case, in addition to the covenants set forth above, the Company shall pay
the Executive 60 days of Base Salary. For all purposes under this Agreement, the
failure by Executive to offer to renew the Agreement following the expiration of
the Initial Term or any Renewal Term on the same terms and conditions hereunder
shall be treated as if the Executive terminated this Agreement pursuant to this
Section 5.5, except that the Executive shall not be entitled to any Base Salary
in excess of that which is due through the last day of Executive's employment
hereunder.

                                      -4-
<PAGE>   5

                           (c) Upon termination of the Term of Employment
pursuant to this Section 5.5 (that is not a termination under Section 5.6) by
the Executive for Good Reason, the Company shall pay to the Executive the same
amounts that would have been payable by the Company to the Executive under
Section 5.4 of this Agreement if the Term of Employment had been terminated by
the Company without Cause. The Company shall have no further liability
hereunder.

                           (d) For purposes of this Agreement, "Good Reason"
shall mean (i) the assignment to the Executive of any duties inconsistent in any
respect with the Executive's position (including status, offices, titles and
reporting requirements), authority, duties or responsibilities as contemplated
by Section 1.2 of this Agreement, or any other action by the Company which
results in a diminution in such position, authority, duties or responsibilities,
excluding for this purpose an isolated, insubstantial and inadvertent action not
taken in bad faith and which is remedied by the Company promptly after receipt
of notice thereof given by the Executive; (ii) any failure by the Company to
comply with any of the provisions of Article 3 of this Agreement, other than an
isolated, insubstantial and inadvertent failure not occurring in bad faith and
which is remedied by the Company promptly after receipt of notice thereof given
by the Executive; (iii) the Company's requiring the Executive to be based at any
office or location outside of the area for which Executive was originally hired
to work except for travel reasonably required in the performance of the
Executive's responsibilities. For purposes of this Section 5.5(d), any good
faith determination of "Good Reason" made by the Board shall be conclusive.

                  5.6      CHANGE IN CONTROL OF THE COMPANY.
                           ---------------------------------

                           (a) In the event that (i) a Change in Control (as
defined in paragraph (b) of this Section 5.6) in the Company shall occur during
the Term of Employment, and (ii) prior to the later of the Expiration Date or
one year after the date of the Change in Control, either (x) the Term of
Employment is terminated by the Company without Cause, pursuant to Section 5.4
hereof or (y) the Executive terminates the Term of Employment for Good Reason
the Company shall (1) pay to the Executive any unpaid Base Salary through the
effective date of termination, (2) pay to the Executive as a single lump sum
payment, within 30 days of the termination of his employment hereunder, a lump
sum payment equal to the sum of (x) two times the sum of Executive's annual Base
Salary, Incentive Compensation, and the value of the annual fringe benefits
(based upon their cost to the Company) required to be provided to the Executive
under Sections 4.2 and 4.4 hereof, for the year immediately preceding the year
in which his employment terminates, plus (y) the value of the portion of his
benefits under any savings, pension, profit sharing or deferred compensation
plans that are forfeited under those plans by reason of the termination of his
employment hereunder. Further, upon the Change in Control, the Executive's Stock
Options shall immediately vest. The Company shall have no further liability
hereunder (other than for (1) reimbursement for reasonable business expenses
incurred prior to the date of termination, subject, however, to the provisions
of Section 4.1, and (2) payment of compensation for unused vacation days that
have accumulated during the calendar year in which such termination occurs).

                           (b) For purposes of this Agreement, the term "Change
in Control" shall mean:

                                    (i) Approval by the shareholders of the
Company of (x) a reorganization, merger, consolidation or other form of
corporate transaction or series of transactions, in each case, with respect to
which persons who were the shareholders of the Company immediately prior to such
reorganization, merger or consolidation or other transaction do not, immediately
thereafter, own more than 50% of the combined voting power entitled to vote
generally in the election of directors of the reorganized, merged or
consolidated company's then outstanding voting securities, in substantially the

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<PAGE>   6

same proportions as their ownership immediately prior to such reorganization,
merger, consolidation or other transaction, or (y) a liquidation or dissolution
of the Company or (z) the sale of all or substantially all of the assets of the
Company (unless such reorganization, merger, consolidation or other corporate
transaction, liquidation, dissolution or sale is subsequently abandoned);

                                    (ii) the acquisition (other than from the
Company) by any person, entity or "group", within the meaning of Section
13(d)(3) or 14(d)(2) of the Securities Exchange Act, of more than 30% of either
the then outstanding shares of the Company's Common Stock or the combined voting
power of the Company's then outstanding voting securities entitled to vote
generally in the election of directors (hereinafter referred to as the ownership
of a "Controlling Interest") excluding, for this purpose, any acquisitions by
(1) the Company or its Subsidiaries, (2) any person, entity or "group" that as
of the Commencement Date of this Agreement owns beneficial ownership (within the
meaning of Rule 13d-3 promulgated under the Securities Exchange Act) of a
Controlling Interest or (3) any employee benefit plan of the Company or its
Subsidiaries.

                                    (iii) The resignation of Manuel D. Medina as
both Chairman and CEO of the Company, his death, or his absence from the day to
day business affairs of the Company for more than 90 consecutive days due to
disability or incapacity.

                  5.7 RESIGNATION. Upon any notice or termination of employment
pursuant to this Article 5, the Executive shall automatically and without
further action be deemed to have resigned as an officer, and if he or she was
then serving as a director of the Company, as a director, and if required by the
Board, the Executive hereby agrees to immediately execute a resignation letter
to the Board.

                  5.8 SURVIVAL. The provisions of this Article 5 shall survive
the termination of this Agreement, as applicable.

         6.       RESTRICTIVE COVENANTS.
                  ----------------------

                  6.1 NON-COMPETITION. At all times while the Executive is
employed by the Company and for a one year period after the termination of the
Executive's employment with the Company for any reason (other than by the
Company without Cause (as defined in Section 5.1 hereof) or by the Executive for
Good Reason (as defined in Section 5.5(d) hereof)), the Executive shall not,
directly or indirectly, engage in or have any interest in any sole
proprietorship, partnership, corporation or business or any other person or
entity (whether as an employee, officer, director, partner, agent, security
holder, creditor, consultant or otherwise) that directly or indirectly (or
through any affiliated entity) engages in competition with the Company (based on
the business in which the Company was engaged or was actively planning on being
engaged as of the date of termination of the Employee's employment and in the
geographic areas in which the Company operated or was actively planning on
operating as of date of termination of the Employee's employment); provided that
such provision shall not apply to the Executive's ownership of: Common Stock of
the Company or the acquisition by the Executive, solely as an investment, of
securities of any issuer that is registered under Section 12(b) or 12(g) of the
Securities Exchange Act of 1934, as amended, and that are listed or admitted for
trading on any United States national securities exchange or that are quoted on
the National Association of Securities Dealers Automated Quotations System, or
any similar system or automated dissemination of quotations of securities prices
in common use, so long as the Executive does not control, acquire a controlling
interest in or become a member of a group which exercises direct or indirect
control or, more than five percent of any class of capital stock of such
corporation.

                                      -6-
<PAGE>   7

                  6.2 NONDISCLOSURE. The Executive shall not at any time
divulge, communicate, use to the detriment of the Company or for the benefit of
any other person or persons, or misuse in any way, any Confidential Information
(as hereinafter defined) pertaining to the business of the Company. Any
Confidential Information or data now or hereafter acquired by the Executive with
respect to the business of the Company (which shall include, but not be limited
to, information concerning the Company's financial condition, prospects,
technology, customers, suppliers, sources of leads and methods of doing
business) shall be deemed a valuable, special and unique asset of the Company
that is received by the Executive in confidence and as a fiduciary, and
Executive shall remain a fiduciary to the Company with respect to all of such
information. For purposes of this Agreement, "Confidential Information" means
information disclosed to the Executive or known by the Executive as a
consequence of or through his employment by the Company (including information
conceived, originated, discovered or developed by the Executive) prior to or
after the date hereof, and not generally known, about the Company or its
business. Notwithstanding the foregoing, nothing herein shall be deemed to
restrict the Executive from disclosing Confidential Information to the extent
required by law.

                  6.3 NONSOLICITATION OF EMPLOYEES AND CLIENTS. At all times
while the Executive is employed by the Company and for a two (2) year period
after the termination of the Executive's employment with the Company for any
reason, the Executive shall not, directly or indirectly, for himself or for any
other person, firm, corporation, partnership, association or other entity (a)
employ or attempt to employ or enter into any contractual arrangement with any
employee or former employee of the Company, unless such employee or former
employee has not been employed by the Company for a period in excess of six
months, and/or (b) call on or solicit any of the actual or targeted prospective
clients of the Company on behalf of any person or entity in connection with any
business competitive with the business of the Company, nor shall the Executive
make known the names and addresses of such clients or any information relating
in any manner to the Company's trade or business relationships with such
customers, other than in connection with the performance of Executive's duties
under this Agreement.

                  6.4 OWNERSHIP OF DEVELOPMENTS. All copyrights, patents, trade
secrets, or other intellectual property rights associated with any ideas,
concepts, techniques, inventions, processes, or works of authorship developed or
created by Executive during the course of performing work for the Company or its
clients (collectively, the "Work Product") shall belong exclusively to the
Company and shall, to the extent possible, be considered a work made by the
Executive for hire for the Company within the meaning of Title 17 of the United
States Code. To the extent the Work Product may not be considered work made by
the Executive for hire for the Company, the Executive agrees to assign, and
automatically assign at the time of creation of the Work Product, without any
requirement of further consideration, any right, title, or interest the
Executive may have in such Work Product. Upon the request of the Company, the
Executive shall take such further actions, including execution and delivery of
instruments of conveyance, as may be appropriate to give full and proper effect
to such assignment.

                  6.5 BOOKS AND RECORDS. All books, records, and accounts
relating in any manner to the customers or clients of the Company, whether
prepared by the Executive or otherwise coming into the Executive's possession,
shall be the exclusive property of the Company and shall be returned immediately
to the Company on termination of the Executive's employment hereunder or on the
Company's request at any time.

                  6.6 DEFINITION OF COMPANY. Solely for purposes of this Article
6, the term "Company" also shall include any existing or future subsidiaries of
the Company that are operating during the time periods described herein and any
other entities that directly or indirectly, through one or

                                      -7-
<PAGE>   8

more intermediaries, control, are controlled by or are under common control with
the Company during the periods described herein.

                  6.7 ACKNOWLEDGMENT BY EXECUTIVE. The Executive acknowledges
and confirms that (a) the restrictive covenants contained in this Article 6 are
reasonably necessary to protect the legitimate business interests of the
Company, and (b) the restrictions contained in this Article 6 (including without
limitation the length of the term of the provisions of this Article 6) are not
overbroad, overlong, or unfair and are not the result of overreaching, duress or
coercion of any kind. The Executive further acknowledges and confirms that his
full, uninhibited and faithful observance of each of the covenants contained in
this Article 6 will not cause him any undue hardship, financial or otherwise,
and that enforcement of each of the covenants contained herein will not impair
his ability to obtain employment commensurate with his abilities and on terms
fully acceptable to him or otherwise to obtain income required for the
comfortable support of him and his family and the satisfaction of the needs of
his creditors. The Executive acknowledges and confirms that his special
knowledge of the business of the Company is such as would cause the Company
serious injury or loss if he were to use such ability and knowledge to the
benefit of a competitor or were to compete with the Company in violation of the
terms of this Article 6. The Executive further acknowledges that the
restrictions contained in this Article 6 are intended to be, and shall be, for
the benefit of and shall be enforceable by, the Company's successors and
assigns.

                  6.8 REFORMATION BY COURT. In the event that a court of
competent jurisdiction shall determine that any provision of this Article 6 is
invalid or more restrictive than permitted under the governing law of such
jurisdiction, then only as to enforcement of this Article 6 within the
jurisdiction of such court, such provision shall be interpreted and enforced as
if it provided for the maximum restriction permitted under such governing law.

                  6.9 EXTENSION OF TIME. If the Executive shall be in violation
of any provision of this Article 6, then each time limitation set forth in this
Article 6 shall be extended for a period of time equal to the period of time
during which such violation or violations occur. If the Company seeks injunctive
relief from such violation in any court, then the covenants set forth in this
Article 6 shall be extended for a period of time equal to the pendency of such
proceeding including all appeals by the Executive.

                  6.10 SURVIVAL. The provisions of this Article 6 shall survive
the termination of this Agreement, as applicable.

         7. INJUNCTION. It is recognized and hereby acknowledged by the parties
hereto that a breach by the Executive of any of the covenants contained in
Article 6 of this Agreement will cause irreparable harm and damage to the
Company, the monetary amount of which may be virtually impossible to ascertain.
As a result, the Executive recognizes and hereby acknowledges that the Company
shall be entitled to an injunction from any court of competent jurisdiction
enjoining and restraining any violation of any or all of the covenants contained
in Article 6 of this Agreement by the Executive or any of his affiliates,
associates, partners or agents, either directly or indirectly, and that such
right to injunction shall be cumulative and in addition to whatever other
remedies the Company may possess.

         8. ASSIGNMENT. Neither party shall have the right to assign or delegate
his rights or obligations hereunder, or any portion thereof, to any other
person.

         9. GOVERNING LAW. This Agreement shall be governed by and construed in
accordance with the laws of the State of Florida.

                                      -8-
<PAGE>   9

         10. SECTION 162(m) LIMITS. Notwithstanding any other provision of this
Agreement to the contrary, if and to the extent that any remuneration payable by
the Company to the Executive for any year would exceed the maximum amount of
remuneration that the Company may deduct for that year under Section 162(m)
("Section 162(m)") of the Internal Revenue Code of 1986, as amended (the
"Code"), payment of the portion of the remuneration for that year that would not
be so deductible under Section 162(m) shall, in the sole discretion of the
Board, be deferred and become payable at such time or times as the Board
determines that it first would be deductible by the Company under Section
162(m), with interest at the "short-term applicable rate" as such term is
defined in Section 1274(d) of the Code. The limitation set forth under this
Section 10 shall not apply with respect to any amounts payable to the Executive
pursuant to Article 5 hereof.

         11. ENTIRE AGREEMENT. This Agreement constitutes the entire agreement
between the parties hereto with respect to the subject matter hereof and, upon
its effectiveness, shall supersede all prior agreements, understandings and
arrangements, both oral and written, between the Executive and the Company (or
any of its affiliates) with respect to such subject matter. This Agreement may
not be modified in any way unless by a written instrument signed by both the
Company and the Executive.

         12. NOTICES. All notices required or permitted to be given hereunder
shall be in writing and shall be personally delivered by courier, sent by
registered or certified mail, return receipt requested or sent by confirmed
facsimile transmission addressed as set forth herein. Notices personally
delivered, sent by facsimile or sent by overnight courier shall be deemed given
on the date of delivery and notices mailed in accordance with the foregoing
shall be deemed given upon the earlier of receipt by the addressee, as evidenced
by the return receipt thereof, or three (3) days after deposit in the U.S. mail.
Notice shall be sent (i) if to the Company, addressed to Terremark.com, Inc.,
2601 S. Bayshore Drive, 9th Floor, Miami, Florida 33133, Attn: Brian K.
Goodkind, Executive Vice-President, and (ii) if to the Executive, to his address
as reflected on the payroll records of the Company, or to such other address as
either party hereto may from time to time give notice of to the other.

         13. BENEFITS; BINDING EFFECT. This Agreement shall be for the benefit
of and binding upon the parties hereto and their respective heirs, personal
representatives, legal representatives, successors and, where applicable,
assigns, including, without limitation, any successor to the Company, whether by
merger, consolidation, sale of stock, sale of assets or otherwise. Specifically,
this Agreement shall be binding upon the survivor of the Merger of the Company
into AmTec, Inc.

         14. SEVERABILITY. The invalidity of any one or more of the words,
phrases, sentences, clauses or sections contained in this Agreement shall not
affect the enforceability of the remaining portions of this Agreement or any
part thereof, all of which are inserted conditionally on their being valid in
law, and, in the event that any one or more of the words, phrases, sentences,
clauses or sections contained in this Agreement shall be declared invalid, this
Agreement shall be construed as if such invalid word or words, phrase or
phrases, sentence or sentences, clause or clauses, or section or sections had
not been inserted. If such invalidity is caused by length of time or size of
area, or both, the otherwise invalid provision will be considered to be reduced
to a period or area which would cure such invalidity.

         15. WAIVERS. The waiver by either party hereto of a breach or violation
of any term or provision of this Agreement shall not operate nor be construed as
a waiver of any subsequent breach or violation.

         16. DAMAGES. Nothing contained herein shall be construed to prevent the
Company or the Executive from seeking and recovering from the other damages
sustained by either or both of them as a

                                      -9-
<PAGE>   10

result of its or his breach of any term or provision of this Agreement. In the
event that either party hereto brings suit for the collection of any damages
resulting from, or the injunction of any action constituting, a breach of any of
the terms or provisions of this Agreement, then the party found to be at fault
shall pay all reasonable court costs and attorneys' fees of the other.

         17. SECTION HEADINGS. The section headings contained in this Agreement
are for reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement.

         18. NO THIRD PARTY BENEFICIARY. Nothing expressed or implied in this
Agreement is intended, or shall be construed, to confer upon or give any person
other than the Company, the parties hereto and their respective heirs, personal
representatives, legal representatives, successors and assigns, any rights or
remedies under or by reason of this Agreement.

         19.      INDEMNIFICATION.
                  ----------------

                           (a) Subject to limitations imposed by law, the
Company shall indemnify and hold harmless the Executive to the fullest extent
permitted by law from and against any and all claims, damages, expenses
(including attorneys' fees), judgments, penalties, fines, settlements, and all
other liabilities incurred or paid by him in connection with the investigation,
defense, prosecution, settlement or appeal of any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative and to which the Executive was or is a party or is threatened to
be made a party by reason of the fact that the Executive is or was an officer,
employee or agent of the Company, or by reason of anything done or not done by
the Executive in any such capacity or capacities, provided that the Executive
acted in good faith, in a manner that was not grossly negligent or constituted
willful misconduct and in a manner he reasonably believed to be in or not
opposed to the best interests of the Company, and, with respect to any criminal
action or proceeding, had no reasonable cause to believe his conduct was
unlawful. The Company also shall pay any and all expenses (including attorney's
fees) incurred by the Executive as a result of the Executive being called as a
witness in connection with any matter involving the Company and/or any of its
officers or directors.

                           (b) The Company shall pay any expenses (including
attorneys' fees), judgments, penalties, fines, settlements, and other
liabilities incurred by the Executive in investigating, defending, settling or
appealing any action, suit or proceeding described in this Section 19 in advance
of the final disposition of such action, suit or proceeding. The Company shall
promptly pay the amount of such expenses to the Executive, but in no event later
than 10 days following the Executive's delivery to the Company of a written
request for an advance pursuant to this Section 19, together with a reasonable
accounting of such expenses.

                           (c) The Executive hereby undertakes and agrees to
repay to the Company any advances made pursuant to this Section 19 if and to the
extent that it shall ultimately be found that the Executive is not entitled to
be indemnified by the Company for such amounts.

                           (d) The Company shall make the advances contemplated
by this Section 19 regardless of the Executive's financial ability to make
repayment, and regardless whether indemnification of the Indemnitee by the
Company will ultimately be required. Any advances and undertakings to repay
pursuant to this Section 19 shall be unsecured and interest-free.

                           (e) The provisions of this Section 19 shall survive
the termination of this Agreement.

                                      -10-
<PAGE>   11

         IN WITNESS WHEREOF, the undersigned have executed this Agreement as of
the date first above written.

                                         COMPANY:

                                         ------------------------------

                                         By:
                                            ---------------------------
                                         Name:
                                         Title:

                                         EXECUTIVE:

                                         ------------------------------
                                         Name
                                             --------------------------

                                      -11-

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