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                                                                   EXHIBIT 10.54

         "THE WARRANTS AND THE SHARES THAT MAY BE PURCHASED UPON THE EXERCISE
OF THE WARRANTS COLLECTIVELY REFERRED TO AS THE ("SHARES") REPRESENTED BY THIS
CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED ("ACT"). SUCH SHARES HAVE BEEN ACQUIRED FOR INVESTMENT AND MAY NOT BE
PUBLICLY OFFERED OR SOLD IN THE ABSENCE OF (1) AN EFFECTIVE REGISTRATION
STATEMENT FOR SUCH SHARES UNDER THE ACT; (2) OPINIONS OF COUNSEL TO INVISA,
INC., PRIOR TO ANY PROPOSED TRANSFER TO THE EFFECT THAT REGISTRATION IS NOT
REQUIRED UNDER THE ACT; OR (3) A LETTER PRESENTED TO INVISA INC., PRIOR TO
ANY PROPOSED TRANSFER, FROM THE STAFF OF THE SECURITIES AND EXCHANGE
COMMISSION, TO THE EFFECT THAT IT WILL NOT TAKE ANY ENFORCEMENT ACTION IF THE
PROPOSED TRANSFER IS MADE WITHOUT REGISTRATION UNDER THE ACT."

VOID AFTER AUGUST 15, 2004

WARRANT CERTIFICATE FOR PURCHASE OF COMMON STOCK

NUMBER                                                          NO. OF WARRANTS
WA 2                           INVISA, INC.                          16,750
   -                                                                 ------

         This certifies that FOR VALUE RECEIVED DELBRUECK BANK or registered
assigns (the "Registered Holder") is the owner of SIXTEEN THOUSAND SEVEN
HUNDRED FIFTY Warrants (the "Warrants"). Each Warrant represented hereby
entitles the Registered Holder to purchase, subject to the terms and conditions
set forth in this Warrant Certificate, one fully paid and non-assessable share
of Common Stock, $0.001 value ("Common Stock"), of Invisa, Inc., a Nevada
corporation (the "Company"), from the date hereof until August 15, 2004, (the
"Expiration Date"), upon the presentation and surrender of this Warrant
Certificate together with the full payment of the Exercise Price in effect on
the date on which written notice of exercise is delivered to the Company as
provided herein. Payment of the Exercise Price must be in the form of lawful
money of the United States delivered by certified, bankers check or other form
acceptable to the Company and delivered to the corporate office of the Company
at 4400 Independence Court, Sarasota, Florida 34234. The exercise price of each
Warrant (the "Exercise Price") is: (i) $5.00 per share until August 15, 2003
(the "Initial Warrant Year") And (ii) From August 16, 2003 to August 15, 2004
(the "Second Warrant Year") the greater of: (i) the average closing trading
price for the Company's common stock during the Initial Warrant Year, or (ii)
$8.00 per share.

The Warrants are redeemable at the option of the Company at $0.10 per warrant
upon 30 days notice to the Registered Holder. In order for the Company to
exercise its right to redeem: during the Initial Warrant Year the Company's
common stock must have traded for 20 consecutive trading days at a closing
trading price above $10.00 per share, or during the Second Warrant Year the
Company's common stock must have traded for 20 consecutive trading days at a
closing trading price above $16.00 per share.

Any Warrants not timely exercised or redeemed automatically expire on August
15, 2004 ("Expiration Date").

The grant of this Warrant is made without registration under the Securities Act
of 1933 as amended (the "Act") by reason of a specific exemption. The Warrants
and Shares to be issued at exercise shall be restricted as to transfer in
accordance with Regulation S and/or Rule 144 of the

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Act, whichever shall be applicable and Shares acquired upon the exercise of the
Warrants will bear a restrictive legend as to transfer in accordance with the
Act.

In the event of a stock dividend or stock split resulting in the number of
outstanding of shares of the Company being changed, the applicable exercise
price, number of shares, redemption price and trading price requirements for
redemption, as provided in the Warrants, shall be proportionately adjusted. In
the event of the merger, consolidation, or combination of the Company into
another company or entity which survives that transaction, the shares which may
be purchased under the Warrants shall be converted into an equivalent number of
shares of the surviving entity. In the event of the sale of all or substantially
all of the assets of the Company, the shares which may be purchased upon the
exercise of the Warrants shall be treated in any distribution as if said shares
are issued and outstanding, with the exception that the exercise price under the
Warrants shall be deducted from the amount to be distributed on a per-share
basis. The Registered Holders of Warrants shall not be entitled to vote or
exercise other rights of stockholders unless and until the Warrants are
exercised and the underlying Shares issued. In the event of redemption by the
Company, each Registered Holder shall be provided 30 days prior written notice
of the Company's intent to redeem, during which notice period the Registered
Holder of the Warrant shall be entitled to exercise the Warrant.

         In the case of the exercise of less than all the Warrants represented
hereby, the Company shall cancel this Warrant Certificate upon the surrender
hereof and shall execute and deliver a new Warrant Certificate or Warrant
Certificates of like tenor for the balance of such Warrants.

         Prior to due presentment for registration of transfer hereof, the
Company may deem and treat the Registered Holder as the absolute owner hereof
and of each Warrant represented hereby (notwithstanding any notations of
ownership or writing hereon made by anyone other than a duly authorized officer
of the Company) for all purposes and shall not be affected by any notice to the
contrary.

         This Warrant Certificate shall be governed by and construed in
accordance with the laws of the State of Florida.

         This Warrant Certificate and the Registered Holder's rights hereunder
are not assignable or transferable by the Registered Holder except in accordance
with the Act and with the written consent of the Company which will not be
unreasonably withheld.

         IN WITNESS WHEREOF, the Company has caused this Warrant Certificate
to be duly executed by two of its officers thereunto duly authorized.

/s/ William W. Dolan                         /s/ Stephen A. Michael, President
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William W. Dolan, Secretary                  Stephen A. Michael, President<PAGE>

                                                                   EXHIBIT 10.55

                                  STOCK OPTION

         THIS CERTIFIES THAT, FOR VALUE RECEIVED, SmartGate, Inc., a Nevada
corporation ("SmartGate, Inc." or the "Company") pursuant to and under the
SmartGate, Inc. 2000 EMPLOYEE, DIRECTOR, CONSULTANT AND ADVISOR STOCK
COMPENSATION PLAN ("Plan"), a copy of which is attached hereto, has on July 26,
2000, granted to Nicole A. Longridge ("Holder") the right and option until July
26, 2007 to purchase 10,000 shares of Common Stock of SmartGate, Inc., at a
purchase price of $3.00 per share. The shares, which may be purchased under this
Option, are subject to vesting as follows: (i) one-third of the shares eligible
for purchase hereunder shall be deemed vested as of July 26, 2000; (ii) another
one-third of the shares eligible to be purchased hereunder shall be deemed
vested on July 26, 2001 provided that Holder remains a Consultant to the Company
through that date; and (iii) the final one-third of the shares eligible for
purchase hereunder shall vest on July 26, 2002 provided that Holder remains a
Consultant to the Company through that date. The Holder acknowledges and agrees
that only shares which are vested may be purchased under this Option. In the
event of an involuntary termination of the Holder by virtue of death of Holder,
all shares under this Option shall be deemed fully vested. In the event of an
involuntary termination of the Holder by the Company during the vesting period
set forth above, only the shares which had vested in accordance with the vesting
schedule set forth above at the time of the involuntary termination by the
Company will be deemed vested upon such involuntary termination.

         In the event of a stock dividend, stock split, or capital
reorganization resulting in the number of outstanding shares of Common Stock of
the Company being changed, the applicable exercise price and number of shares
provided in this Option shall be proportionately adjusted.

         In the event of a share-exchange, merger, or other business combination
involving the Company and resulting in a change in control of the Company, all
shares under this Option shall be deemed vested. In the event of the sale of all
or substantially all of the assets or stock of the Company, or in the event of a
liquidation or dissolution of the Company, all shares under this Option shall be
deemed vested.

         The grant of this Option is made without registration under the
Securities Act of 1933 by reason of a specific exemption. The Holder agrees that
the Company's obligation to issue shares under this Option shall be contingent
upon the Company receiving an opinion from securities

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counsel for the Company that there exists a suitable exemption from registration
under the Securities Act of 1933 and the appropriate state securities law for
the issuance of shares which may be purchased by Holder hereunder ("Exemption").
If the Company determines a suitable Exemption exists, the Holder agrees that
the Company may impose any conditions on the exercise of the Option as it deems
necessary to satisfy the Exemption including but not limited to: (i) requiring
the Holder, prior to each and every purchase of shares under this Option, to
execute and fully abide by the provisions of the Letter of Investment Intent
which is attached hereto; and (ii) requiring the Holder, if requested by the
Company, to engage an investor representative to assist the Holder in evaluating
the investment in the Company prior to the purchase of any shares hereunder.

         The Holder acknowledges and agrees that the representations and
agreements Holder makes in the Letter of Investment Intent referenced above
shall survive each closing of share purchases and issuance transactions between
the Holder and the Company.

         If the Company is a "Reporting Company" under the Securities Act of
1934 at the time the Holder wishes to exercise and purchase shares hereunder,
the Company, in its sole discretion, may elect to register the shares the Holder
wishes to purchase so that the shares, when purchased under this Option, are
freely tradable. If the Company elects to register the shares, such registration
shall be at the Company's expense; however, the Holder acknowledges and agrees
that the Company shall be under no obligation to undertake such registration.

         The purchase price for the shares purchased under this Option may be
paid in cash or through the execution of a broker-assisted cashless exercise if
applicable.

         As a condition to the issuance of shares of Common Stock of the Company
under this Option, the Holder agrees to remit to the Company at the time of any
exercise of this Option any taxes required to be withheld by the Company under
Federal, State, or Local law as a result of the exercise of this Option.

         This Option may not be transferred by the Holder other than by Will or
the laws of descent and distribution. This Option may not be exercised by anyone
other than the Holder or, in the case of the Holder's death, by the person to
whom the rights of the Holder shall have passed by Will or the laws of descent
and distribution.

         Neither the Holder nor any person to whom the rights of the Holder
shall have passed by Will or the laws of descent and distribution shall have any
of the rights of a shareholder with

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respect to any shares of the Company's common stock until the purchase price for
the shares has been paid to the Company.

         The Holder represents and warrants that he or she has been provided
with the Plan which is attached hereto and has read and understands the Letter
of Investment Intent which the Holder will be required to sign prior to the
purchase of shares hereunder which is attached hereto, and that he or she has
been advised or has had the opportunity to be advised by his or her own legal
counsel as to the meaning and effect of this Stock Option Agreement, the Plan,
and the Letter of Investment Intent, and of the rights and responsibilities in
connection therewith, and of the consequences of any exercise of this Option.

         The Company has caused this Option Agreement to be executed in the name
of the Company, by its corporate officers having been duly authorized and the
Holder has hereunto set Holder's hand and seal as of the date and year first
above written.

SMARTGATE, INC.
a Nevada corporation

By:
   ---------------------------------
Its:

AGREED TO AND ACCEPTED BY HOLDER:

------------------------------------
Nicole A. Longridge

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