Document:

<PAGE>
                                                                   Exhibit 10.13

                                                               February 25, 2000
Seachange International, Inc.
124 Acton Street
Maynard, Massachusetts 02481
Attn: Mr. William Fiedler, Chief Financial Officer

     Re:  Silicon Valley Bank Loan Arrangement with
          Seachange International, Inc.

Dear Sir/Madam:

     Reference is made to a certain loan arrangement dated November 10, 1998 by
and between Seachange International, Inc. (the "BORROWER") and Silicon Valley
Bank (the "BANK"), evidenced by, among other documents, a certain Loan and
Security Agreement between the Borrower and the Bank dated as of November 10,
1998 (as the same has been amended and extended to date, the "LOAN AGREEMENT").
Capitalized terms not otherwise defined herein shall have the meanings set forth
in the Loan Agreement.

     Notwithstanding anything to the contrary contained in the Loan Agreement
or otherwise, the term "Revolving Maturity Date" as set forth in the Loan
Agreement shall now mean and refer to the date March 31, 2000. Any and all
Credit Extensions made pursuant to he Loan Agreement shall (i) continue to be
secured by all Collateral, and (ii) be repaid in full at the earlier of (A) the
occurrence of any Event of Default, or (B) March 31, 2000.

     All other terms and conditions contained in the Loan Agreement shall
remain in full force and effect.

                                  Sincerely,

                                  SILICON VALLEY BANK,
                                  d/b/a SILICON VALLEY EAST

                                  By: /s/ John K. Peck
                                     ----------------------

                                  Name: John K. Peck
                                       --------------------
                                  Title: Vice President
                                        -------------------

ACCEPTED AND AGREED:

SEACHANGE INTERNATIONAL, INC.

By: /s/ WL Fiedler
   ----------------------

Name: WL Fiedler
     --------------------
Title: Vice President
      -------------------

<PAGE>

                                                February 25, 2000

Silicon Valley Bank
40 William Street, Suite 350
Wellesley, Massachusetts 02181

     Re: Silicon Valley Bank Loan Arrangements with
         Seachange International, Inc.

Gentlemen:

     Reference is made to a certain loan arrangement (the "Loan Arrangement")
entered into as of November 10, 1998 by and between Seachange International,
Inc. (the "Borrower") and Silicon Valley Bank (the "Bank"), evidenced by, among
other documents, a certain Loan and Security Agreement dated as of November 10,
1998 by and between the Borrower and Bank (as amended and extended to date, the
"Loan Agreement").

     Reference is further made to a certain Unconditional Guaranty (the
"Guaranty") dated November 10, 1998, executed and delivered by the undersigned
(the "Guarantor"), pursuant to which the undersigned unconditionally guaranteed
the prompt, punctual and faithful payment and performance of the obligations
and liabilities of the Borrower to the Bank (the "Obligations").

     The Guarantor hereby;

     (a) ratifies, confirms and reaffirms, all and singular, the terms and
         conditions for the Guaranty;

     (b) acknowledges, confirms and agrees that the Guaranty shall remain in
         full force and effect; and

     (c) acknowledges, confirms and agrees that the obligations and liabilities
         for Borrower to Bank under the Guaranty include, without limitation,
         the Loan Agreement and 2000 Agreement.

    Further, the undersigned acknowledges, confirms and agrees that it has no
offsets, defenses, claims or counterclaims against the Bank with respect to the
Borrower's and/or the undersigned's respective liabilities and obligations due
and owing to the Bank, and that to the extent that the undersigned has or has
ever had any such offsets, defenses, claims or counterclaims, the undersigned
hereby specifically WAIVES and RELEASES any and all rights to same.

     This letter shall take effect as a sealed instrument under the laws of the
Commonwealth of Massachusetts as of the date first written above.

                                  Very truly yours,

                                  ("Guarantor")

                                  GUESTSERVE NETWORKS, INC.

                                  By: /s/ William L. Fiedler
                                     -----------------------------
                                  Name: William L. Fiedler
                                       ---------------------------
                                  Title: Vice President
                                        --------------------------
                                                 (duly authorized)
<PAGE>
                                                  February 25, 2000

Silicon Valley Bank
40 William Street, Suite 350
Wellesley, Massachusetts 02181

     Re: Silicon Valley Bank Loan Arrangements with
         Seachange International, Inc.

Gentlemen:

     Reference is made to a certain loan arrangement (the "Loan Arrangement")
entered into as of November 10, 1998 by and between Seachange International,
Inc. (the "Borrower") and Silicon Valley Bank (the "Bank"), evidenced by, among
other documents, a certain Loan and Security Agreement dated as of November 10,
1998 by and between the Borrower and Bank (as amended and extended to date, the
"Loan Agreement").

     Reference is further made to a certain Unconditional Guaranty (the
"Guaranty") dated November 10, 1998, executed and delivered by the undersigned
(the "Guarantor"), pursuant to which the undersigned unconditionally guaranteed
the prompt, punctual and faithful payment and performance of the obligations
and liabilities of the Borrower to the Bank (the "Obligations").

     The Guarantor hereby;

     (a) ratifies, confirms and reaffirms, all and singular, the terms and
         conditions for the Guaranty;

     (b) acknowledges, confirms and agrees that the Guaranty shall remain in
         full force and effect; and

     (c) acknowledges, confirms and agrees that the obligations and liabilities
         for Borrower to Bank under the Guaranty include, without limitation,
         the Loan Agreement and 2000 Agreement.

    Further, the undersigned acknowledges, confirms and agrees that it has no
offsets, defenses, claims or counterclaims against the Bank with respect to the
Borrower's and/or the undersigned's respective liabilities and obligations due
and owing to the Bank, and that to the extent that the undersigned has or has
ever had any such offsets, defenses, claims or counterclaims, the undersigned
hereby specifically WAIVES and RELEASES any and all rights to same.

     This letter shall take effect as a sealed instrument under the laws of the
Commonwealth of Massachusetts as of the date first written above.

                                  Very truly yours,

                                  ("Guarantor")

                                  GUESTSERVE NETWORKS, INC.

                                  By: /s/ William L. Fiedler
                                     -----------------------------
                                  Name: William L. Fiedler
                                       ---------------------------
                                  Title: Vice President
                                        --------------------------
                                                 (duly authorized)<PAGE>
                                                                   Exhibit 10.43

                                                             960 Turnpike Street
                                                                Canton, MA 02021
                                                                  (781) 821-4152

December 14, 1999

Via Facsimile Federal Express
-----------------------------

Mr. Jay Silverstein
Enviro-zyme International, Inc.
P.O. Box 169
Stormville Mountain Road
Stormville, NY 12582

Dear Mr. Silverstein:

     Pursuant to the option to renew and extend the lease agreement dated
January 6, 1997 between Geerlings & Wade, Inc. ("Tenant") and Enviro-zyme
International, Inc. (the "Lease"), Tenant hereby renews and extends the Lease
for a period of three (3) years at the annual rent as defined in the Lease.
Please acknowledge acceptance of this exercise of the option to renew and extend
the Lease by signing and dating below and sending me back an original.

      Please do not hesitate to call me at (781) 821-4152 ext. 3026 if you have
any questions.

                                               Very truly yours,

                                               /s/ David Pearce

                                               David Pearce
                                               Vice President and Chief
                                               Financial Officer

Agreed and acknowledged by:

Enviro-zyme International, Inc.

/s/ Jay Silverstein           12/17/99
-------------------           Date
Jay Silverstein
President
<PAGE>

                    ENVIRO-ZYME INTERNATIONAL, Incorporated
                                 P.O. BOX 169
                          STORMVILLE, NEW YORK 12582

December 18, 1999

Mr. David Pearce
Vice President and Chief Financial Officer
Geerlings & Wade
960 Turnpike Street
Canton, MA 02021

Dear Mr. Pearce:

As per the lease agreement dated between Geerlings & Wade Incorporated
("Tenant") and Enviro-Zyme International, Incorporated ("Leasee") does hereby
accept the Tenants option to rent such lease. Furthermore, as per such lease,
item #1(b), states that the annual rent will be increased by the "cumulative
increase calculated by taking the increase in the New York/New Jersey Consumer
Price Index". From March l, 1997 through November 30, 1999 the Consumer Price
Index has risen 4.7%, which converts to an annual rent increase of $4,573.38.
The annual rent will be adjusted on March l, 2000 from $97,305.94 to
$101,879.32. The annual rent will be paid in 12 monthly installments of
$8,489.94. Please acknowledge your understanding and confirmation of this rent
increase no later than December 27, 1999.

Very truly yours,

/s/ Jay Silverstein

Jay Silverstein
President

JS/ts

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