<PAGE>
                                                                   EXHIBIT 10.30

                                PROMISSORY NOTE

$200,000 USD                                                    October 28, 2002

FOR VALUE RECEIVED, the undersigned, Invisa, Inc., a Nevada Corporation, of 4400
Independence Court, Sarasota, Florida 34234 ("Borrower") promises to pay to the
order of Daimler Capital Partners, Ltd., a British Virgin Islands Corporation,
at 2, rue Thalberg CP 1507 CH-1211 Geneva 1 Switzerland ("Lender") or such other
place as the holder may designate in writing to the undersigned, the principal
sum of two hundred thousand United States Dollars ($200,000 USD), (the "Funds")
together with prepaid interest thereon from date hereof until paid, at the rate
of fifteen percent (15%) per annum as follows:

The entire principal amount and prepaid interest of two hundred ten thousand
United States Dollars ($210,000 USD) shall be repaid on February 28, 2003 but
may be extended at the option of the Borrower until April 28, 2003 on terms
described below (the "Extension Option"). The Extension Option shall allow the
borrower to extended its payment of principal and prepaid interest beyond
February 28, 2003. Payments made after February 28, 2003 shall equal the
principal amount and prepaid interest of two hundred fifteen thousand United
States Dollars ($215,000 USD). If the Borrower elects the Extension Option, then
the Borrower shall grant the Lender an option to purchase fifty thousand
(50,000) common shares par value $0.001 of Invisa, Inc. at $1.00 per share until
April 28, 2006. The underlying shares shall have the same registration rights as
described below for the options described as the "Setup Fee".

Payments shall be applied first to prepaid interest and the balance to
principal.

All or any part of the aforesaid principal sum and prepaid interest may be
prepaid at any time and from time to time without penalty. The Borrower agrees
to pay to Lender ten percent (10%) of any funds received by the Borrower from
the placement of the Borrower's equity of any kind or funds received from
additional debt the Borrower may arrange, excluding the Borrower's existing
lines of credit, funds from new loans guaranteed by shareholders, funds from new
loans from shareholders or funds from trade debt, as partial loan repayment.

In the event of any default by the undersigned in the payment of principal or
prepaid interest when due or in the event of the suspension of actual business,
insolvency, assignment for the benefit of creditors, adjudication of bankruptcy,
or appointment of a receiver, of or against the undersigned, the unpaid balance
of the principal sum and prepaid interest of this promissory note shall at the
option of the holder become immediately due and payable.

Borrower's obligations in this Promissory Note are secured by a security
interest in certain personal property of the Borrower as reflected in the
Security Agreement dated the same date as this Promissory Note.

The Borrower agrees to file a registration statement on Form 10 or Form 10-SB
with the

<PAGE>

Securities and Exchange Commission (the "SEC Filings") within ten (10) days of
the receipt of the Funds. Failure of Borrower to exercise its best efforts to do
so will constitute a default of this Promissory Note and the principal amount
and prepaid interest will immediately become due and payable.

In consideration for arranging the Funds, the Lender is entitled to a Setup Fee
(the "Set Up Fee") consisting of the following:

         1.       Option to purchase 200,000 common shares par value $0.001 of
                  Invisa Inc. expiring October 28, 2006.
         2.       The right to demand registration of the underlying stock
                  commencing June 28, 2004.
         3.       The strike price of the option will be determined by the
                  repayment of the principal amount and prepaid interest as
                  follows:
                           -        Repayment within 30 days of receipt of the
                                    Funds the strike price shall be $3.00 per
                                    share
                           -        Repayment within 60 days of receipt of the
                                    Funds the strike price shall be $2.00 per
                                    share
                           -        Repayment within 90 days of receipt of the
                                    Funds the strike price shall be $1.50 per
                                    share
                           -        Repayment 91 days or more after the receipt
                                    of the Funds the strike price shall be $1.00
                                    per share

The maker waives demand, presentment, protest, notice of dishonor or nonpayment,
notice of protest, and any and all lack of diligence or delays in collection
which may occur, and expressly consent and agree to each and any extension or
postponement of time of payment hereof from time to time at or after maturity or
other indulgence, and waive all notice thereof.

In case suit or action is instituted to collect this note, or any portion
hereof, the maker promises to pay such additional sum, as the court may adjudge
reasonable, attorneys' fees in said proceedings.

This note is made and executed under, and is in all respects governed by, the
laws of the State of Florida.



                                            Invisa, Inc.



                                            By: /s/ Stephen A. Michael/President
                                               ---------------------------------
                                               Authorized Signatory
<PAGE>
                               SECURITY AGREEMENT

THIS SECURITY AGREEMENT ("Agreement") is made and effective this October 28,
2002, by and between Invisa, Inc., a Nevada Corporation ("Borrower"), and
Daimler Capital Partners, Ltd, a British Virgin Islands Corporation ("Secured
Party").

Borrower is in the debt of Secured Party.

Borrower desires to give, and Secured Party desires to receive, a security
interest in certain tangible personal property of Borrower to secure such debt.

NOW, THEREFORE, Secured Party and Borrower agree as follows:

1. DEFINITIONS.

A. "Collateral": The following described tangible, personal property of
Borrower: (i) Five hundred thousand (500,000) restricted common shares par value
$0.001 of Invisa, Inc. registered in the name of Daimler Capital Partners, Ltd.;
and (ii) all additions and substitutions to or for the items referred to in
Section 1.(A) (i) above, and all proceeds therefrom.

B. "Obligation": All of the interest, principal and other amounts payable under
that certain promissory note dated October 28, 2002, payable by Borrower to
Secured Party for two hundred thousand United States Dollars ($200,000 USD),
bearing interest at a rate of fifteen percent (15%) per annum, a copy of which
is attached hereto as Exhibit A.

2. SECURITY INTEREST.

Borrower hereby grants to Secured Party a security interest in the Collateral in
order to secure payment of the Obligation.

3. BOOKS AND RECORDS; INSPECTION.

Borrower shall keep and maintain, at its expense, complete records of the
Collateral. Secured Party shall have the right at any time and from time to
time, without notice, to call at Borrower's place of business during normal
business hours to inspect the correspondence, books, and records of Borrower
relating to the Collateral.

4. REPRESENTATIONS AND WARRANTIES OF BORROWER.

Borrower represents and warrants to Secured Party that, with respect to the
Collateral, Borrower possesses and shall possess at all times while this
Security Agreement is in effect, full, complete and unencumbered title to such
goods, subject only to Secured Party's security interest hereunder, and liens,
if any, for current taxes, assessments and other governmental charges are not
delinquent.

5. COVENANTS OF BORROWER.

The Borrower agrees and covenants with Secured Party that:

A. The Collateral shall be kept at the offices of G.M. Capital Partners Ltd.
Borrower shall not change the location of the Collateral without the prior
written consent of Secured Party.

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B. Borrower shall not at any time cause or suffer any part of the Collateral, or
any interest in any of Collateral to be subject to any Security Interest other
than that of Secured Party.

C. Borrower shall defend the Collateral against the claims and demands of all
persons other than Secured Party.

D. Borrower shall at all times promptly pay and discharge, at Borrower's
expense, all taxes, assessments and other governmental charges which constitute
or may become liens on the Collateral.

E. At the request of Secured Party, at any time and from time to time, Borrower
shall execute such financing statements and other documents, pay such filing,
recording and other fees, and do or cause to be done such other acts or things
as Secured Party deems reasonably necessary to establish, perfect, and continue
its security interest hereunder.

F. Borrower shall pay all costs, expenses, charges and other obligations,
including, without limitation, reasonable attorneys' fees, suffered or incurred
by Secured Party to protect, preserve, maintain and obtain possession of or
title to the Collateral, to perfect, protect, preserve and maintain the security
interest granted by this Security Agreement, and to enforce or assert any one or
more of its rights, powers, remedies and defenses under this Security Agreement.

6. EVENTS OF DEFAULT.

Borrower shall be in default under this Security Agreement if Borrower fails
timely to observe and perform any covenants, conditions or agreements required
to be observed or performed by Borrower under this Security Agreement, or if
Borrower defaults upon any material promise in the obligation.

7. REMEDIES UPON EVENT OF DEFAULT.

At any time upon or following written notice of the occurrence without cure of
one or more of the events of default under Section 6 hereof, the collateral
shall be delivered to the Lender as full payment of all principal and interest
due under the terms of the Promissory Note

8. NOTICES.

Any notice required by this Agreement or given in connection with it, shall be
in writing and shall be given to the appropriate party by personal delivery or
by certified mail, postage prepaid, or recognized overnight delivery services.



                  If to Borrower:

                           Invisa, Inc.
                           4400 Independence Court
                           Sarasota, Florida 34234

<PAGE>

                  If to Secured Party:

                           Daimler Capital Partners, Ltd
                           2, rue Thalberg
                           CP 1507
                           CH-1211 Geneve 1

9. SEVERABILITY.

The invalidity or unenforceability of any provision in this Agreement shall not
cause any other provision to be invalid or unenforceable.

10. FINAL AGREEMENT.

This Agreement constitutes the final agreement and understanding between the
parties on the subject matter hereof and supersedes all prior understandings or
agreements whether oral or written. This Agreement may be modified only by a
further writing that is duly executed by both parties.

11. HEADINGS.

Headings used in this Agreement are provided for convenience only and shall not
be used to construe meaning or intent.

IN WITNESS WHEREOF, Borrower and Secured Party have executed this Security
Agreement on the date first above written.



Invisa, Inc.                           Daimler Capital Partners, Ltd



By: /s/Stephen A. Michael, President   By: /s/Walter Stopfer
   ---------------------------------      --------------------------------------
   Authorized Signatory                   Authorized Signatory
                                          Director
<PAGE>
                                ESCROW AGREEMENT

         This Escrow Agreement ("Agreement") is made and effective as of October
28, 2002, by and among Invisa, Inc., a Nevada corporation ("Borrower"), Daimler
Capital Partner Ltd., a British Virgin Islands corporation ("Lender"), and G.M.
Capital Partners, Ltd. ("Escrow Agent").

         WHEREAS, on October 28, 2002, Borrower and Lender entered into a
Security Agreement, a copy attached hereto as Exhibit "A", and Borrower
delivered a Promissory Note to Lender in connection with that certain $200,000
loan transaction as described in the Promissory Note and Security Agreement
attached hereto; and

         WHEREAS, pursuant to the Security Agreement, the collateral for the
loan transaction is 500,000 restricted shares of the Borrower's Common Stock
issued in the name of Lender ("Collateral") which is to be delivered to and held
by the Escrow Agent; and

         WHEREAS, the parties wish to set forth the terms and conditions
pursuant to which the Escrow Agreement shall hold and return the Collateral to
Borrower upon payment of the Promissory Note or deliver the Collateral to the
Lender in the event of a default as set forth in the Promissory Note and the
Security Agreement.

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

1.       Collateral - Share Certificate - The Borrower shall instruct its
         Transfer Agent to issue a stock certificate in the name of Lender for
         500,000 shares of Invisa, Inc. Common Stock and have same delivered to
         Escrow Agent.

2.       Location of Collateral - The Escrow Agent shall, at all times, hold the
         Collateral at its offices at:

                           G.M. Capital Partners, Ltd.
                           Usteristrasse 19
                           POB 6681
                           8023 Zurich
                           Switzerland
                           Attention: Mr. J.A. Michie

3.       Return of Collateral to Borrower - Upon payment of all principal and
         interest due under the Promissory Note, Borrower shall provide Escrow
         Agent with evidence of full payment. Escrow Agent shall promptly notify
         Lender of such notification and Lender shall have three days within
         which to deny that full payment of principal and interest has been
         made. Failing such timely contest from Lender, Escrow Agent shall
         promptly deliver the Collateral to the Borrower via overnight mail at
         the address reflected in Paragraph 6 below. In the event of a timely
         notice of contest by Lender, Escrow Agent shall hold the Collateral
         until the parties resolve the dispute.

<PAGE>

4.       Delivery of Collateral to Lender Upon Default - Lender shall notify
         Escrow Agent of any default. Escrow Agent shall provide Borrower with
         notification of the default and Borrower shall have three days within
         which to submit a notice of contest. In the absence of a timely notice
         of contest, Escrow Agent shall deliver the Collateral held in Escrow to
         Lender as full payment of all principal and interest and other amounts
         due under the Promissory Note. Should Borrower provide a timely notice
         of contest, Escrow Agent shall hold the Collateral until the parties
         resolve the dispute.

5.       Validity of Notice and Instruction - The Escrow Agent may assume that
         any notice or instruction received by it hereunder is authentic and has
         been duly and validly given, pursuant to due authorization by or on
         behalf of the person by which or on behalf of which it purports to be
         given, and the Escrow Agent shall have no duty to inquire with respect
         thereto.

6.       Notices - All notices shall be made via overnight delivery and shall be
         deemed effective when received by the noticed party at the addresses
         set forth below:

                           Invisa, Inc.
                           4400 Independence Court
                           Sarasota, Florida 34234

                           Daimler Capital Partners, Ltd.
                           2, rue Thalberg
                           CP 1507
                           CH - 1211 Geneve 1

                           G.M. Capital Partners, Ltd.
                           Usteristrasse 19
                           POB 6681
                           8023 Zurich
                           Switzerland
                           Attention Mr. J.A. Michie

7.       Governing Law - This Escrow Agreement shall be governed by and
         construed in accordance with the laws of the State of Florida without
         giving effect to conflict of law principles. Any legal action relating
         to the Collateral or this Agreement shall be brought only in and each
         of the parties hereto consents to the jurisdiction of Florida in the
         Circuit Courts in and for Sarasota County, Florida.

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the year and date first written above.



Invisa, Inc.                           Daimler Capital Partners, Ltd.



By: /s/Stephen A. Michael/President    By: /s/ Walter Stopfer/
-----------------------------------       --------------------------------------



G.M. Capital Partners, Ltd.



By: /s/ J.A. Michie
-----------------------------------
<PAGE>

                                  STOCK OPTION

         THIS CERTIFIES THAT, FOR VALUE RECEIVED, Invisa, Inc., a Nevada
corporation ("Invisa, Inc." or the "Company") has, on October 28, 2002, granted
to Daimler Capital Partners Ltd. ("Holder") the right and option until October
28, 2006 to purchase 200,000 shares of Common Stock of Invisa, Inc., at a
purchase price of $1.00 per share.

         This Option is being issued in accordance with the terms of that
certain Promissory Note dated October 28, 2002, executed by the Company as
Borrower and delivered to the Holder as Lender.

         Commencing on June 28, 2004, Holder shall have the right to demand that
the Company file and exercise reasonable efforts to effect a Registration
Statement under the Securities Act of 1933 (the "Act"), covering the 200,000
shares which may be purchased under this Option. Such demand to register said
shares shall be in writing, executed by Holder and shall state Holder's
intention to exercise the Option to purchase the shares demanded to be
registered. The cost of any such Registration Statement shall be borne solely by
the Company provided that the Company shall not be required to pay any
commissions, legal fees or other sales cost incurred by the Holder. 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 and number of
shares, as provided in this Option, 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 this Option 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 Option shall be treated in any distribution as if said shares
are issued and outstanding, with the exception that the exercise price under
this Option shall be deducted from the amount to be distributed on a per-share
basis.

         The grant of this Option is made without registration under the Act by
reason of a specific exemption. The Option and shares to be issued at exercise
shall (unless registered in accordance with this Option) be restricted as to
transfer in accordance with Rule 144 of the Act.

         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



<PAGE>
                                                                               2

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 without the consent of the Company.

         The Holder shall not have any of the rights of a shareholder with
respect to any shares of the Company's common stock until the purchase price for
the shares has been paid to the Company.

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


INVISA, INC.                                   AGREED TO AND ACCEPTED BY HOLDER:
a Nevada corporation                           DAIMLER CAPITAL PARTNERS, LTD.



By:    /s/  Stephen A. Michael                 By:      /s/ Walter Stopfer
     -------------------------------              ------------------------------
Its:   President                               Its:     Managing Director





<PAGE>

                                  STOCK OPTION

         THIS CERTIFIES THAT, FOR VALUE RECEIVED, Invisa, Inc., a Nevada
corporation ("Invisa, Inc." or the "Company") has, on February 28, 2003, granted
to Daimler Capital Partners Ltd. ("Holder") the right and option until April 28,
2006 to purchase 50,000 shares of Common Stock of Invisa, Inc., at a purchase
price of $1.00 per share.

         This Option is being issued in accordance with the terms of that
certain Promissory Note dated October 28, 2002, executed by the Company as
Borrower and delivered to the Holder as Lender.

         Commencing on June 28, 2004, Holder shall have the right to demand that
the Company file and exercise reasonable efforts to effect a Registration
Statement under the Securities Act of 1933 (the "Act"), covering the 50,000
shares which may be purchased under this Option. Such demand to register said
shares shall be in writing, executed by Holder and shall state Holder's
intention to exercise the Option to purchase the shares demanded to be
registered. The cost of any such Registration Statement shall be borne solely by
the Company provided that the Company shall not be required to pay any
commissions, legal fees or other sales cost incurred by the Holder. 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 and number of
shares, as provided in this Option, 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 this Option 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 Option shall be treated in any distribution as if said shares
are issued and outstanding, with the exception that the exercise price under
this Option shall be deducted from the amount to be distributed on a per-share
basis.

         The grant of this Option is made without registration under the Act by
reason of a specific exemption. The Option and shares to be issued at exercise
shall (unless registered in accordance with this Option) be restricted as to
transfer in accordance with Rule 144 of the Act.

         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


<PAGE>

                                                                               2

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 without the consent of the Company.

         The Holder shall not have any of the rights of a shareholder with
respect to any shares of the Company's common stock until the purchase price for
the shares has been paid to the Company.

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


INVISA, INC.                                   AGREED TO AND ACCEPTED BY HOLDER:
a Nevada corporation                           DAIMLER CAPITAL PARTNERS, LTD.



By:    /s/  Stephen A. Michael                 By:        /s/ Walter Stopfer
     -------------------------------                 ---------------------------
Its:   President                               Its:        Managing Director