Document:

EXHIBIT 4.18

                               NOVOSTE CORPORATION

                          EMPLOYEE STOCK PURCHASE PLAN

      1. Purpose and Scope of Plan. The purpose of this employee stock purchase
plan (the "Plan") is to provide the employees of Novoste Corporation ("Novoste")
with an opportunity to acquire a proprietary interest in Novoste through the
purchase of its common stock and, thus, to develop a stronger incentive to work
for the continued success of Novoste. The Plan is intended to be an "employee
stock purchase plan" within the meaning of Section 423(b) of the Internal
Revenue Code of 1986, as amended, and shall be interpreted and administered in a
manner consistent with such intent.

      2. Definitions.

      2.1.  The terms defined in this section are used (and capitalized)
            elsewhere in this Plan.

            (a)   "Affiliate" means any corporation that is a "parent
                  corporation" or "subsidiary corporation" of Novoste, as
                  defined in Sections 424(e) and 424(f) of the Code or any
                  successor provision, and whose participation in the Plan has
                  been approved by the Board of Directors.

            (b)   "Board of Directors" means the Board of Directors of Novoste.

            (c)   "Code" means the Internal Revenue Code of 1986, as amended
                  from time to time.

            (d)   "Committee" means two or more Novoste's executive officers as
                  designated by the Board of Directors to administer the Plan
                  under Section 13.

            (e)   "Common Stock" means the common stock, par value $.01 per
                  share (as such par value may be adjusted from time to time),
                  of Novoste.

            (f)   "Company" means Novoste Corporation, a Florida corporation.

            (g)   "Compensation" means the gross cash compensation (including
                  wage, salary, commission, and overtime earnings but excluding
                  bonus and other special types of compensation and
                  reimbursements) paid by Novoste or any Affiliate to a
                  Participant in accordance with the terms of employment.

            (h)   "Eligible Employee" means any employee of Novoste or an
                  Affiliate whose customary employment is for more than five
                  months in any calendar year and whose customary employment is
                  at least 20 hours per week; provided, however, that "Eligible
                  Employee" shall not include any person who would be deemed,
                  for purposes of Section 423(b)(3) of the Code, to own, after
                  giving effect to the grant of any rights pursuant to this
                  Plan, stock possessing 5% or more of the total combined voting
                  power or value of all classes of stock of Novoste.

            (i)   "Exchange Act" means the Securities Exchange Act of 1934, as
                  amended.

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            (j)   "Fair Market Value" of a share of Common Stock as of any date
                  means, if the Common Stock is listed on a national securities
                  exchange or traded in the national market system, the closing
                  price for such Common Stock on such exchange or national
                  market system on the immediately preceding day on which the
                  Common Stock was traded. If such determination of Fair Market
                  Value is not consistent with the then current regulations of
                  the Secretary of the Treasury applicable to plans intended to
                  qualify as an "employee stock purchase plan" within the
                  meaning of Section 423(b) of the Code, however, Fair Market
                  Value shall be determined in accordance with such regulations.
                  The determination of Fair Market Value shall be subject to
                  adjustment as provided in Section 14.

            (k)   "Participant" means an Eligible Employee who has elected to
                  participate in the Plan in the manner set forth in Section 4.

            (l)   "Plan" means this Novoste Employee Stock Purchase Plan, as
                  amended from time to time.

            (m)   "Purchase Period" means each quarter of Novoste's fiscal year.
                  The first Purchase Period will be the quarter that starts July
                  1, 2000 and ends September 30, 2000.

            (n)   "Recordkeeping Account" means the account maintained in the
                  books and records of Novoste recording the amount withheld
                  from each Participant through payroll deductions made under
                  the Plan.

      3. Scope of the Plan. Shares of Common Stock may be sold to Eligible
Employees pursuant to this Plan commencing July 1, 2000, as hereinafter
provided, but not more than 100,000 shares of Common Stock (subject to
adjustment as provided in Section 14) shall be sold to Eligible Employees
pursuant to this Plan. All sales of Common Stock pursuant to this Plan shall be
subject to the same terms, conditions, rights and privileges. The shares of
Common Stock sold to Eligible Employees pursuant to this Plan may be shares
acquired by purchase on the open market or in privately negotiated transactions,
by direct issuance from Novoste (whether newly issued or treasury shares) or by
any combination thereof. Novoste, during the term of the Plan, shall at all
times reserve and keep available, such number of shares as shall be sufficient
to satisfy the requirements of the Plan.

      4. Eligibility and Participation. To be eligible to participate in the
Plan for a given Purchase Period, an employee must be an Eligible Employee on
the cutoff date for such Purchase Period. The cutoff date is the 15th day of the
month immediately preceding the Purchase Period. An Eligible Employee may elect
to participate in the Plan by filing a subscription agreement and payroll
deduction authorization form with the Novoste Stock Plan Administrator before
the prescribed cutoff date for each Purchase Period. Regular payroll deductions
from Compensation will begin with the first payday in such Purchase Period and
continue until the Eligible Employee withdraws from the Plan, modifies his or
her authorization, or ceases to be an Eligible Employee, as hereinafter
provided.

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      5. Amount of Common Stock Each Eligible Employee May Purchase.

      5.1.  Subject to the provisions of this Plan, each Eligible Employee shall
            be offered the right to purchase on the last day of the Purchase
            Period the number of shares of Common Stock that can be purchased at
            the price specified in Section 5.2 with the entire credit balance in
            the Participant's Recordkeeping Account; provided, however, that the
            Fair Market Value (determined on the first day of any Purchase
            Period) of shares of Common Stock that may be purchased by a
            Participant during any calendar year shall not exceed $25,000
            (therefore, with a 15% discount, the maximum cash contribution can
            not exceed $21,250). If the purchases by all Participants would
            otherwise cause the aggregate number of shares of Common Stock to be
            sold under the Plan to exceed the number specified in Section 3,
            each Participant shall be allocated a ratable portion of the maximum
            number of shares of Common Stock which may be sold.

      5.2.  The purchase price of each share of Common Stock sold pursuant to
            this Plan shall be the lesser of (a) or (b) below:

            (a)   85% of the Fair Market Value of such share on the first day of
                  the Purchase Period.

            (b)   85% of the Fair Market Value of such share on the last day of
                  the Purchase Period.

      6. Method of Participation.

      6.1.  Novoste shall give notice to each Eligible Employee of the
            opportunity to purchase shares of Common Stock pursuant to this Plan
            and the terms and conditions for such offering. Such notice is
            subject to revision by Novoste at any time prior to the date of
            purchase of such shares. Novoste contemplates that for tax purposes
            the first day of a Purchase Period will be the date of the offering
            of such shares.

      6.2.  Each Eligible Employee who desires to participate in the Plan for a
            Purchase Period shall signify his or her election to do so by
            signing a subscription agreement and payroll deduction authorization
            form. An Eligible Employee may elect to have any whole percent of
            Compensation withheld per pay period. An election to participate in
            the Plan and to authorize payroll deductions as described herein
            must be made prior to the prescribed cutoff date for each Purchase
            Period to which it relates and shall remain in effect unless and
            until such Participant withdraws from the Plan, modifies his or her
            authorization, or ceases to be an Eligible Employee, as hereinafter
            provided.

      6.3.  Any Eligible Employee who does not make a timely election as
            provided in Section 6.2, shall be deemed to have elected not to
            participate in the Plan. Such election shall be irrevocable for such
            Purchase Period.

      6.4.  Nothing herein contained shall affect an employee's right to
            participate in and receive benefits under and in accordance with the
            then current provisions of any pension, insurance, retirement
            savings/401(k) plan or other employee welfare plan or program of
            Novoste.

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      7. Recordkeeping Account.

      7.1.  Novoste shall maintain a Recordkeeping Account for each Participant.
            Payroll deductions pursuant to Section 6 shall be credited to such
            Recordkeeping Accounts on each payday.

      7.2.  No interest shall be credited to a Participant's Recordkeeping
            Account.

      7.3.  The Recordkeeping Account is established solely for accounting
            purposes, and all amounts credited to the Recordkeeping Account
            shall remain part of the general assets of Novoste.

      7.4.  A Participant may not make any separate cash payment into the
            Recordkeeping Account.

      8. Right to Adjust Participation or to Withdraw.

      8.1.  A Participant may, at any time during a Purchase Period, direct
            Novoste to make no further deductions from his or her future
            Compensation, subject to the limitation in Section 6.2. Upon any
            such action, future payroll deductions with respect to such
            Participant shall cease in accordance with the Participant's
            direction.

      8.2.  Any Participant who stops payroll deductions may not thereafter
            resume payroll deductions during such Purchase Period.

      8.3.  At any time before the end of a Purchase Period, any Participant may
            withdraw from the Plan. In such event, all future payroll deductions
            shall cease. The Participant may direct that the entire credit
            balance in the Participant's Recordkeeping Account be used to
            purchase stock at the end of the Purchase Period or be paid to the
            Participant, without interest, in cash. A Participant who withdraws
            from the Plan will not be eligible to reenter the Plan until the
            next succeeding Purchase Period.

      8.4.  Notification of a Participant's election to increase, decrease, or
            terminate deductions, or to withdraw from the Plan, shall be made by
            filing an appropriate form with Novoste. Notification to increase or
            decrease deductions received before the prescribed cutoff date for
            each Purchase Period will become effective that Purchase Period.

      9. Termination of Employment. If a Participant's employment is terminated
prior to the end of a Purchase Period for any reason, including death, permanent
disability, or retirement, the entire balance in the Participant's Recordkeeping
Account will be applied to the purchase of shares as described above as of the
last day of the Purchase Period in which the Participant's employment
terminated; except that if such Participant so requests prior to the last day of
such Purchase Period, the Company shall refund in cash within 30 days all
amounts credited to his or her Recordkeeping Account.

      10. Purchase of Shares.

      10.1. As of the last day of each Purchase Period, the entire credit
            balance in each Participant's Recordkeeping Account shall be used to
            purchase shares of Common Stock (subject to the limitations of
            Section 5) unless the Participant has filed an appropriate form with
            Novoste in advance of that date (which elects to receive the

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            entire credit balance in cash). No fractional shares shall be
            purchased; any credit balance which is not sufficient to purchase a
            full share shall be retained in the Participant's account for the
            subsequent Purchase Period.

      10.2. Shares of Common Stock acquired by each Participant shall be held in
            a general securities brokerage account maintained for the benefit of
            all Participants with a registered securities broker/dealer selected
            by the Company (the "Agent"). The Agent shall maintain subaccounts
            for each Participant in such general account to which shall be
            allocated such Participant's shares of Common Stock.

      10.3. Prior to the last day of each Purchase Period, Novoste shall
            determine whether some or all of the shares of Common Stock to be
            purchased as of the last day of such Purchase Period will be
            purchased by the Agent for the accounts of Participants on the open
            market or in privately negotiated transactions. If some or all of
            such shares are to be so purchased by the Agent, Novoste shall
            advise the Agent of the number of shares to be so purchased and
            shall provide to the Agent such funds, in addition to the funds
            available from Participants' Recordkeeping Accounts, as may be
            necessary to permit the Agent to so purchase such number of shares
            (including all brokerage fees and expense).

      10.4. Dividends with respect to a Participant's shares of Common Stock
            held in the account maintained by the Agent shall automatically be
            reinvested in additional shares of Common Stock. The Agent shall
            commingle all dividends paid on all Participants' shares held in the
            account and shall purchase on the open market, or in privately
            negotiated transactions, as soon as reasonably practicable after the
            receipt of the dividends, as many shares of Common Stock as can be
            acquired with such commingled dividends and the purchase price of
            each such Reinvestment Share shall be the average price paid by the
            Agent in purchasing all Reinvestment Shares for all Participants
            with the proceeds of such dividend payment. There shall be allocated
            to each Participant's individual account such Participant's pro rata
            portion of the Reinvestment Shares purchased with the commingled
            funds. Novoste shall pay all brokerage fees and expenses of the
            Agent in connection with the reinvestment of dividends.

      10.5. Each Participant shall be entitled to vote all shares held for the
            benefit of such Participant in the account maintained by the Agent.

      10.6. Certificates for the number of whole shares of Common Stock,
            determined as aforesaid, purchased by each Participant shall be
            issued and delivered to him or her, registered in the form directed
            by the Participant, only upon the request of the Participant or his
            or her representative. Any such request shall be made by filing an
            appropriate form with Novoste.

      11. Rights as a Stockholder. A Participant shall not be entitled to any of
the rights or privileges of a stockholder of Novoste with respect to shares of
Common Stock under the Plan, including the right to receive any dividends which
may be declared by Novoste, until (i) he or she actually has paid the purchase
price for such shares and (ii) either the shares have been credited to the
account maintained by the Agent for the Participant's benefit or certificates
have been issued to the Participant, both as provided in Section 10.

      12. Rights Not Transferable. A Participant's rights under this Plan are
exercisable only by the Participant during his or her lifetime, and may not be
sold, pledged, assigned or

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transferred in any manner other than by will or the laws of descent and
distribution. Any attempt to sell, pledge, assign or transfer the same shall be
null and void and without effect. The amounts credited to a Recordkeeping
Account may not be assigned, transferred, pledged or hypothecated in any way,
and any attempted assignment, transfer, pledge, hypothecation or other
disposition of such amounts will be null and void and without effect.

      13. Administration of the Plan. This Plan shall be administered by the
Committee, which is authorized to make such uniform rules as may be necessary to
carry out its provisions. The Committee shall determine any questions arising in
the administration, interpretation and application of this Plan, and all such
determinations shall be conclusive and binding on all parties. All costs, taxes
and expenses incurred in administering the Plan shall be paid by Novoste. Any
costs, taxes and expenses applicable to the Participant's account shall be
charged or credited to the Participant's account by Novoste.

      14. Adjustment upon Changes in Capitalization. In the event of any change
in the Common Stock by reason of stock dividends, split-ups, corporate
separations, recapitalizations, mergers, consolidations, combinations, exchanges
of shares and the like, the aggregate number and class of shares available under
this Plan and the number, class and purchase price of shares available but not
yet purchased under this Plan, shall be adjusted appropriately by the Committee.

      15. Registration of Certificates. Stock certificates to be issued and
delivered upon the request of the Participant or his or her representative, as
provided in Section 10.6, shall be, registered in the name of the Participant,
or jointly, as joint tenants with the right of survivorship, in the name of the
Participant and another person, as the Participant or his or her representative
may direct on an appropriate form filed with Novoste.

      16. Amendment of Plan. Novoste expects to continue the Plan until such
time as the shares reserved for issuance under the Plan have been sold. Novoste
reserves, however, the right at any time to amend this Plan in any respect which
shall not adversely affect the rights of Participants pursuant to shares
previously acquired under the Plan, except that, without stockholder approval on
the same basis as required by Section 19.1, no amendment shall be made (i) to
increase the number of shares to be reserved under this Plan, (ii) decrease the
minimum purchase price, (iii) to withdraw the administration of this Plan from
the Committee, or (iv) to change the definition of employees eligible to
participate in the Plan.

      17. Effective Date of Plan. This Plan shall consist of an offering
commencing July 1, 2000, and continuing on a quarterly basis thereafter. All
rights of Participants in any offering hereunder shall terminate at the earlier
of (i) the day that Participants become entitled to purchase a number of shares
of Common Stock equal to or greater than the number of shares remaining
available for purchase or (ii) at any time, at the discretion of the Board of
Directors, after 30 days' notice has been given to all Participants. Upon
termination of this Plan, shares of Common Stock shall be purchased for
Participants in accordance with Section 10.1, and cash, if any, remaining in the
Participants' Recordkeeping Accounts shall be refunded to them, as if the Plan
were terminated at the end of a Purchase Period.

      18. Governmental Regulations and Listing. All rights granted or to be
granted to Eligible Employees under this Plan are expressly subject to all
applicable laws and regulations and to the approval of all governmental
authorities required in connection with the authorization, issuance, sale or
transfer of the shares of Common Stock reserved for this Plan, including,
without limitation, there being a current registration statement of Novoste
under the Securities

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Act of 1933, as amended, covering the shares of Common Stock purchasable on the
last day of the Purchase Period applicable to such shares, and if such a
registration statement shall not then be effective, the term of such Purchase
Period shall be extended until the first business day after the effective date
of such a registration statement, or post-effective amendment thereto. All such
rights hereunder are also similarly subject to effectiveness of an appropriate
listing application to the Nasdaq National Market, covering the shares of Common
Stock under the Plan upon official notice of issuance.

      19. Miscellaneous.

      19.1. This Plan shall be submitted for approval by the stockholders of
            Novoste prior to January 1, 2001. If not so approved prior to such
            date, this Plan shall terminate on December 31, 2000.

      19.2. This Plan shall not be deemed to constitute a contract of employment
            between Novoste and any Participant, nor shall it interfere with the
            right of Novoste to terminate any Participant and treat him or her
            without regard to the effect which such treatment might have upon
            him or her under this Plan.

      19.3. Wherever appropriate as used herein, the masculine gender may be
            read as the feminine gender, the feminine gender may be read as the
            masculine gender, the singular may be read as the plural and the
            plural may be read as the singular.

      19.4. The Plan, and all agreements hereunder, shall be construed in
            accordance with and governed by the laws of the State of Florida.

      19.5. Delivery of shares of Common Stock or of cash pursuant to the Plan
            shall be subject to any required withholding taxes. A person
            entitled to receive shares of Common Stock may, as a condition
            precedent to receiving such shares, be required to pay Novoste a
            cash amount equal to the amount of any required withholdings.

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                                                                    Exhibit 4.03
                                 CERTIFICATE OF
                                   AMENDMENT
                                       OF
                           THIRD AMENDED AND RESTATED
                          CERTIFICATE OF INCORPORATION
                               OF VERISIGN, INC.

     VeriSign, Inc., a corporation organized and existing under the General
Corporation Law of the State of Delaware (the "Corporation"), whose original
Certificate of Incorporation was filed in the Office of the Secretary of State
of the State of Delaware on April 12, 1995 under the name of Digital
Certificates International, Inc., subsequently amended on April 18, 1995 and
July 7, 1995, subsequently amended and restated on February 15, 1996,
subsequently amended on August 22, 1996, subsequently amended and restated on
November 14, 1996, subsequently amended on November 18, 1997 and January 27,
1998, subsequently amended and restated on February 4, 1998, and subsequently
amended on May 27, 1999, does hereby certify:

     A resolution amending the Corporation's Third Amended and Restated
Certificate of Incorporation was approved by the Corporation's Board of
Directors and Stockholders, and that such amendment was adopted in accordance
with the provisions of Section 242 of the Delaware General Corporation Law:

     Paragraph A of Article Four is hereby amended in its entirety to read as
follows:

     FOUR: A.  The Corporation is authorized to issue two classes of stock to be
     designated, respectively, "Common Stock" and "Preferred Stock."  The total
     number of shares which the Corporation is authorized to issue is One
     Billion Five Million (1,005,000,000) shares. One Billion (1,000,000,000)
     shares shall be Common Stock, $0.001 par value per share, and Five Million
     (5,000,000) shares shall be Preferred Stock, $0.001 par value per share.

     IN WITNESS WHEREOF, VeriSign, Inc. has caused this Certificate to be signed
and attested by its duly authorized officers this 8th day of June 2000.

                              VERISIGN, INC.

                              By /s/ Stratton Sclavos
                                ---------------------
                              Stratton Sclavos, President

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