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                                                                     Exhibit 4.1

                       THIRD AMENDMENT TO RIGHTS AGREEMENT

         THIS THIRD AMENDMENT TO RIGHTS AGREEMENT (this "Amendment") is made as
of the 13th day of November, 2000, by and between SYSTEMONE TECHNOLOGIES INC., a
Florida corporation (the "Company"), and CONTINENTAL STOCK TRANSFER & TRUST
COMPANY (the "Rights Agent").

                                    RECITALS

         WHEREAS, on October 1, 1998, the Board of Directors of the Company
authorized and declared a dividend distribution of one Right for each share of
common stock, $.001 par value, of the Company outstanding at the close of
business on October 8, 1998;

         WHEREAS, the Company and the Rights Agent entered into a certain Rights
Agreement, dated as of October 1, 1998 (the "Rights Agreement"), providing,
among other things, for the issuance of the Rights (all capitalized terms used
in this Amendment and not otherwise defined herein shall have the meanings
ascribed to such terms in the Rights Agreement);

         WHEREAS, the Company and the Rights Agent amended the Rights Agreement
pursuant to the First Amendment to Rights Agreement, dated as of May 24, 2000;

         WHEREAS, the Company and the Rights Agent amended the Rights Agreement
pursuant to the Second Amendment to Rights Agreement, dated as of August 7,
2000; and

         WHEREAS, the Board of Directors of the Company has approved a third
amendment to the Rights Agreement as hereinafter set forth, pursuant to a
unanimous written consent dated on or about the date hereof.

         NOW, THEREFORE, in consideration of the premises and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

         1. Section 1 of the Rights Agreement is hereby amended by deleting the
definition of "Acquiring Person" set forth in subsection (a) thereof in its
entirety and substituting therefor a new definition of "Acquiring Person" to
read as follows:

         "Acquiring Person" shall mean any Person who or which, together with
         all Affiliates and Associates of such Person, shall be the Beneficial
         Owner of fifteen percent (15%) or more of the shares of Common Stock
         outstanding. Notwithstanding the foregoing, the term "Acquiring Person"
         shall not include (i) the Company, any Subsidiary of the Company, any
         employee benefit plan of the Company or of any Subsidiary of the
         Company, or any Person or entity organized, appointed or established by
         the Company for or pursuant to the terms of any such

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         plan, (ii) Pierre G. Mansur, unless such individual shall be the
         beneficial owner of fifty percent (50%) or more of the shares of Common
         Stock then outstanding, (iii) Hanseatic Americas LDC, unless it shall
         be the beneficial owner of forty-five percent (45%) or more of the
         shares of Common Stock then outstanding, (iv) Environmental
         Opportunities Fund II (Institutional), L.P., Environmental
         Opportunities Fund II, L.P., Environmental Opportunities Fund, L.P., or
         Environmental Opportunities Fund II (Cayman), L.P., unless such Persons
         shall be the Beneficial Owners, individually or in the aggregate, of
         thirty-five percent (35%) or more of the shares of Common Stock then
         outstanding, (v) Safety-Kleen Systems, Inc., unless it shall be the
         beneficial owner of nineteen and one-half percent (19.5%) or more of
         the shares of Common Stock then outstanding, or (vi) any Person who or
         which, together with all Affiliates and Associates of such Person,
         would be an Acquiring Person solely by reason of a reduction in the
         number of issued and outstanding shares of Common Stock of the Company
         pursuant to a transaction or series of related transactions approved by
         a majority of the Independent Directors, if any, then in office and
         approved by a Supermajority Vote; provided, further, however, that in
         the event that such Person described in the foregoing clause (vi) does
         not become an Acquiring Person by reason of the foregoing clause (vi),
         such Person shall nonetheless become an Acquiring Person in the event
         such Person thereafter acquires Beneficial Ownership of an additional
         one percent (1%) of the Common Stock of the Company, unless such
         additional Common Stock ownership results solely from a subsequent
         reduction in the number of issued and outstanding shares of Common
         Stock of the Company.

         2. Except as specifically amended hereby, the Rights Agreement is and
remains unmodified and in full force and effect and is hereby ratified and
confirmed.

         3. This Amendment shall be deemed a contract made under the laws of the
State of Florida and for all purposes shall be governed by and construed in
accordance with the laws of such State applicable to contracts made and to be
performed entirely within such State.

         4. This Amendment may be executed in counterparts, each of which shall
for all purposes be deemed to be an original, and shall constitute but one and
the same instrument.

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         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed as of the date first above written.

                                                    SYSTEMONE TECHNOLOGIES INC.

                                                    By:
                                                       ------------------------

                                                    CONTINENTAL STOCK TRANSFER &
                                                    TRUST COMPANY

                                                    By:
                                                       ------------------------

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                                                                    EXHIBIT 10.1

                    SETTLEMENT AGREEMENT AND MUTUAL RELEASE
                    ---------------------------------------

     THIS SETTLEMENT AGREEMENT AND MUTUAL RELEASE (the "Agreement") is entered
into by and between Oce Printing Systems U.S.A., Inc., a Delaware corporation,
Oce Printing Systems, G.m.b.H., a German corporation (collectively "OPS") and
Interscience Computer Corporation, a California corporation ("Interscience"), in
settlement of any and all claims between OPS and Interscience, including but not
limited to the claims and counterclaim made in the action pending in the Circuit
Court for Pinellas County, Florida, Circuit Civil Case No. 96-7077-CI-8 ("the
Florida Action"); in the action pending in the District of Maryland at Civil
Action No. CCB 99-386 ("the Maryland Action"); and in the interference
proceeding pending before the U.S. Patent Office at Interference No. 103692
("the Patent Action").

     WHEREAS, Interscience and others commenced the Florida Action against OPS
and others to recover damages arising out of conduct with respect to sales and
service practices relating to certain high-speed printers;

     WHEREAS, OPS and Jeffrey Zillmer filed the Maryland Action against
Interscience for conduct arising out of Interscience's practice of United
States Patent No. 5,333,042, issued July 26, 1994, entitled "Cold Fusing Agent"
("the '042 Patent");

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     WHEREAS, Interscience filed the Patent Action in the United States Patent
Office for conduct relating to the '042 Patent;

     WHEREAS, OPS and Interscience have denied liability to each other and
maintained their respective claims to the '042 Patent; and

     WHEREAS, it being the intention of the parties to settle and resolve all
disputes that are or may be asserted between them which relate to the subject
matter of the Florida Action, the Maryland Action and the Patent Action;

     NOW, THEREFORE, in consideration of the matters referred to herein, and
intending to be legally bound, OPS and Interscience agree as follows:

     1.   The parties shall take all steps within their authority and control
(but not including any new litigation) to conclude the Maryland Action insofar
as it relates to the '042 Patent. The parties will cause the Patent Action to be
terminated in the manner agreed upon by their respective patent counsel. Each
party shall bear its own attorneys' fees, expenses and other costs. Furthermore,
OPS hereby assigns (without any warranty of assignment) to Interscience and
Interscience hereby accepts all of OPS's rights and obligations under the
contract between OPS and Zillmer dated December 29, 1998, relating to the '042
Patent.

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     2.   Interscience acknowledges that it is no longer a class representative
in the Florida Action and that it will take no action to attempt to become a
class representative.

     3.   Interscience agrees that it will take all steps necessary to opt out
of any class, whether for litigation or settlement purposes, that may be finally
certified against OPS in the Florida Action. Interscience acknowledges that by
opting out of any such class finally certified against OPS, it will not share in
any potential monetary benefits that may be provided to the class in resolution
of the claims. Each party shall bear its own attorneys' fees, expenses and other
costs.

     4.   OPS agrees that henceforth it will not challenge the '042 Patent and
will transfer to Interscience the Goldman Application Serial Number 081 196090.

     5.   OPS shall order and Interscience shall deliver 5,000 cases of fusing
agent, for which OPS shall pay the current price of $72.00 per case, without
any canister deposit, and with a price reduction of $61,544.00 reflecting an
adjustment for former canister deposits. Accordingly, the net purchase price
shall be $298,456.00 for the 5,000 cases.

     6.   OPS agrees to, and following the execution of this Agreement, shall
pay Interscience the amount of $950,000.00 by wire transfer on or before
December 31, 1999.

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     7.   In consideration of OPS's release, described below, and the other
matters contained herein, Interscience releases and forever discharges OPS, its
officers, agents, employees, attorneys, parent corporations, subsidiaries,
related entities, affiliates, divisions, successors, persons acting on its
behalf in connection with the matters set forth above, and/or assigns, and any
and all other persons, firms, partnerships and corporations which are or might
be claimed to be liable to Interscience, its successors and assigns, of and from
any and all claims, counterclaims, rights, demands, costs, damages, losses,
liabilities, actions, and causes of action including attorneys' fees and court
costs of every nature and description, whether known or unknown, suspected or
unsuspected, foreseen or unforeseen, real or imaginary, actual or potential, and
whether arising in tort or contract or at law or in equity, under the common
law, state law, federal law, or any other law, or otherwise, including but not
limited to canister deposit claims and claims which have been or which might
have been asserted in the Florida Action, the Maryland Action and the Patent
Action, it being the intention of Interscience to effect a general release of
all such claims against OPS.

     8.   In further consideration of OPS's release describe below, and the
other matters contained herein, Interscience releases and forever discharges
Siemens Nixdorf Printing Systems, L.P., Siemens Credit Corporation, Siemens

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Nixdorf Information Systems Inc., and Siemens-Nixdorf Informationssysteme AG,
their officers, agents, employees, attorneys, parent corporations,
subsidiaries, related entities, affiliates, divisions, successors, persons
acting on its behalf in connection with the matters set forth above, and/or
assigns, and any and all other persons, firms, partnerships and corporations
which are or might be claimed to be liable to Interscience, its successors and
assigns, of and from any and all claims, counterclaims, rights, demands, costs,
damages, losses, liabilities, actions, and causes of action for conduct after
April 1, 1996, including attorneys' fees and court costs of every nature and
description, whether known or unknown, suspected or unsuspected, foreseen or
unforeseen, real or imaginary, actual or potential, and whether arising in tort
or contract or at law or in equity, under the common law, state law, federal
law, or any other law, or otherwise, it being intention of Interscience to
effect a general release of all such specified claims.

     9.   In consideration for Interscience's release, described above, and the
other matters contained herein, OPS releases and forever discharges
Interscience, its officers, agents, employees, attorneys, parent corporations,
subsidiaries, affiliates, related entities, divisions, predecessors,
successors, persons acting on its behalf in connection with the matters set
forth above, and/or assigns, and any and all other

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persons, firms, partnerships and corporations which are or might be claimed to
be liable to OPS, its successors and assigns, of and from any and all claims,
counterclaims, rights, demands, costs, damages, losses, liabilities, actions,
and causes of action including attorneys' fees and court costs of every nature
and description, whether known or unknown, suspected or unsuspected, foreseen
or unforeseen, real or imaginary, actual or potential, and whether arising in
tort or contract or at law or in equity, under the common law, state law,
federal law, or any other law, or otherwise, including but not limited to
canister deposit claims and claims or counterclaims which have been or which
might have been asserted in the Florida Action, the Maryland Action and the
Patent Action, it being the intention of OPS to effect a general release of all
such claims against Interscience.

     10.  OPS and Interscience further covenant and agree that this Agreement
is intended to cover not only all known claims arising out of, or in any way
related to the Florida Action, the Maryland Action and the Patent Action, but
also any claims in the future, arising out of, or in any way relating to the
issues raised by those Actions, not now known or anticipated, which may develop
later, and that no further lawsuits shall be filed by either party against the
other arising out of the subject matter of the three Actions or this Agreement.

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     11.  OPS and Interscience further understand and agree that they will not
enter or file suit against the released parties herein with respect to the
claims mentioned above. OPS and Interscience further agree that, in addition to
other relief, either party shall be entitled to reasonable attorneys' fees,
costs and the expenses of litigation incurred in defending any action filed in
breach of this provision.

     12.  OPS and Interscience deny liability of any sort with respect to the
claims and counterclaims made in the three Actions. This Agreement is made as a
compromise of the disputed claims between OPS and Interscience, to avoid
further expense and to terminate finally and completely the controversies
between the parties. Interscience further understands, covenants and agrees
that the payment of the above-mentioned cash consideration does not constitute
any admission of liability by OPS or any other persons, firms or partnerships,
with regard to the three Actions.

     13.  It is further understood, and agreed, that this Agreement is the full
and complete agreement between OPS and Interscience and that there are no other
agreements, covenants, promises, or arrangements other than those set forth
herein. It is further agreed that this Agreement will be construed in
accordance with and governed by Delaware law.

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     14.  This Agreement may be executed in counterparts, all of which together
shall constitute one and the same instrument. The facsimile signature of any
party shall be effective as an original signature.

     In witness whereof and intending to be legally bound, Oce Printing Systems
U.S.A., Inc., Oce Printing Systems, G.m.b.H., and Interscience Computer
Corporation have caused this Agreement and Mutual Release to be executed by
their duly authorized representatives, on this 29th day of December, 1999.

ATTEST:                             OCE PRINTING SYSTEMS U.S.A., INC.
                                    OCE PRINTING SYSTEMS, G.m.b.H.

/s/ Debra H. [illegible]             By: /s/ Daniel I. Booker
-------------------------                ------------------------------
                                         Daniel I. Booker
                                         Counsel

ATTEST:                              INTERSCIENCE COMPUTER CORPORATION

/s/ [illegible]                      By: /s/ Walter Kornbluh
-------------------------                ------------------------------

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