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                                                    Bank of America, N.A.
                                                    Western Maryland Commercial
                                                    1070 West Patrick Street
                                                    Frederick, MD 21703-3963

                                                    Tel 301.698.6073
                                                    Fax 301.696.0179

March 16, 2000

Pierre Desjardins
Chairman of the Board
Total Containment, Inc.
A130 North Drive
P.O. Box 939
Oaks, Pennsylvania 19456

Re:  Covenant Compliance

Dear Pierre:

You have advised us that as of December 31, 1999 actual tangible net worth,
as defined in the existing Loan Agreement dated December 14, 1999 between Total
Containment, Inc. and Bank of America, was leas than the initial requirement.
The specific covenant requirement is as follows:

o  Section 4.A.i. -- Maintain a Tangible Net Worth of not less than $6,250,000
   as of December 31, 1999, increasing by 50% of net income after taxes for
   the fiscal year ending December 31, 2000.

Based on our understanding of the factors that contributed to the company's
equity position at the end of 1999, the Bank hereby agrees to retroactively
reset the minimum tangible net worth requirement at $5,000,000 as of December
31, 1999. The Loan Agreement will be modified to reflect this change and we will
notify you when the necessary documents have been prepared.

Please let me know if you have any questions about the new requirement.

Sincerey,

/s/ Richard C. Marshall
------------------------------
Richard C. Marshall III
Senior Vice PresidentEXHIBIT 4.4

                                 AMENDMENT NO. 3
                                     to the
                                RIGHTS AGREEMENT
                                     Between
                     INTERDIGITAL COMMUNICATIONS CORPORATION
                                       and
                    AMERICAN STOCK TRANSFER AND TRUST COMPANY
                                   dated as of
                                DECEMBER 31, 1996

THIS AMENDMENT NO. 3, dated as of March 24, 2000, to the RIGHTS AGREEMENT
between INTERDIGITAL COMMUNICATIONS CORPORATION and AMERICAN STOCK TRANSFER AND
TRUST COMPANY dated as of DECEMBER 31, 1996.

WHEREAS, InterDigital Communications Corporation ("InterDigital") and American
Stock Transfer and Trust Company ("ASTT") entered into a Rights Agreement, dated
as of December 31, 1996 (the "Agreement"); and

WHEREAS, the Independent Directors, as defined in Section 1(l) of the Agreement
have unanimously approved all of the following amendments, and particularly the
amendment set forth in paragraph (1) below, as required by Section 26 of the
Agreement; and

WHEREAS, InterDigital desires to amend the Agreement as set forth more
specifically below; and

WHEREAS, to implement the desired Amendments, already approved by the
InterDigital Board of Directors, InterDigital and ASTT, pursuant to Section 26
of the Agreement, have agreed to amend the Agreement as set forth herein.

NOW THEREFORE, the parties, intending to be legally bound, agree as follows:

                  (1) The Purchase Price designated in Section 7(b), and in any
other place in which it appears in such Rights Agreement, shall be changed from
$45.00 to $250.00

                  (2) The definition of "Acquiring Person" in Section 1(a) shall
be amended to read as follows:

                           "(a) "Acquiring Person" means any Person (other than
                           the Company, any Subsidiary of the Company, any
                           employee benefit plan maintained by the Company or
                           any of its Subsidiaries or any trustee or fiduciary
                           with respect to such plan acting in such capacity)
                           that shall be the Beneficial Owner of 10% or
                           more of the shares of Common Stock then outstanding;
                           provided, however, that the term "Acquiring Person"
                           shall not include an Exempt

                                       -1-
<PAGE>

                           Person. Notwithstanding the foregoing, if a majority
                           of the Independent Directors determines in good faith
                           that a Person who would otherwise be an Acquiring
                           Person has become such inadvertently and without any
                           intention of changing or influencing control of the
                           Company, and if such Person divests himself or itself
                           as promptly as practicable of a sufficient number of
                           such shares of Common Stock so that such Person would
                           no longer be the Beneficial Owner of that percentage
                           of shares which would otherwise result in him or it
                           being an Acquiring Person, then such Person shall not
                           be deemed to be or to have become an Acquiring Person
                           for any purposes of this Agreement. A majority of the
                           Independent Directors may make all determinations of
                           fact and intent necessary for purposes of the
                           preceding exception so long as made by them in good
                           faith."

                  (3)      Section 1(c)(i) shall be amended by adding the
following phrase at the end of such subsection:

                           "but the foregoing exception shall not apply, whether
                           or not reportable by such Person on Schedule 13D
                           under the Exchange Act, if such voting power arises
                           from a revocable proxy given in response to a proxy
                           or consent solicited by or on behalf of such Person
                           and in furtherance of such Person's publicly
                           announced intention to acquire control, through any
                           means, over the Company or its Board of Directors or
                           in furtherance of such Person's publicly announced
                           and unsolicited intention to acquire all or
                           substantially all of the assets or stock of the
                           Company;"

                  (4)      The definition of "Stock Acquisition Date" in Section
1(v) shall be amended to read as follows:

                           "(v) "Stock Acquisition Date" means the earliest of
                           (i) the first date of public announcement (including,
                           without limitation, the filing of any report pursuant
                           to Section 13(d) of the Exchange Act) by the Company
                           or an Acquiring Person that an Acquiring Person has
                           become such; (ii) the date that a majority of the
                           Independent Directors first becomes aware that an
                           Acquiring Person has become such; or (iii) the actual
                           date, to the extent such can be ascertained with
                           certainty by the Company or a majority of the
                           Independent Directors, that an Acquiring Person
                           actually became such."

                  (5) Clause (i) of Section 3(a) shall be amended as follows:

                           "Until (i) the earliest of (x) the Close of Business
                           on the tenth Business Day after the Stock Acquisition
                           Date, (y) the Close of Business on the tenth Business
                           Day after the date that a tender or exchange offer by
                           any Person (other than the Company, any Subsidiary of
                           the Company, any

                                       -2-
<PAGE>

                           employee benefit plan maintained by the Company or
                           any of its Subsidiaries or any trustee or fiduciary
                           with respect to such plan acting in such capacity) is
                           first published or sent or given within the meaning
                           of Rule 14d-4(a) of the Exchange Act Regulations or
                           any successor rule, if upon consummation thereof such
                           Person would be the Beneficial Owner of 10% or more
                           of the shares of Company Common Stock then
                           outstanding, or (z) the Close of Business on the
                           tenth Business Day after the first date that any
                           Person (other than the Company, any Subsidiary of the
                           Company, any employee benefit plan maintained by the
                           Company or any of its Subsidiaries or any trustee or
                           fiduciary with respect to such plan acting in such
                           capacity) publicly announces an intent to acquire
                           control over the Company and proposes in a proxy or
                           consent solicitation (including a public announcement
                           of such or the preliminary filing of a proxy or
                           consent solicitation statement with the Securities
                           and Exchange Commission) to elect such number of
                           directors as, were they elected, would represent a
                           change of control in the composition of the Board of
                           Directors of the Company such that the nominees of
                           such Person, if elected, would outnumber the
                           Independent Directors on the Board of Directors of
                           the Company, or (ii) ..."

                  (6)      Section 26 shall be amended as follows:

                           "Section 26. Supplements and Amendments. Prior to the
                           Distribution Date and subject to the penultimate
                           sentence of this Section 26, the Company and the
                           Rights Agent shall, if the Company so directs,
                           supplement or amend any provision of this Agreement
                           without the approval of any holders of certificates
                           evidencing shares of Company Common Stock. From and
                           after the Distribution Date, the Company and the
                           Rights Agent shall, if the Company so directs,
                           supplement or amend this Agreement without the
                           approval of any holders of Rights Certificates in
                           order (i) to cure any ambiguity, (ii) to correct or
                           supplement any provision contained herein that may be
                           defective or inconsistent with any other provisions
                           herein, (iii) to shorten or lengthen any time period
                           hereunder, or (iv) to change or supplement the
                           provisions hereunder in any manner that the Company
                           may deem necessary or desirable and that shall not
                           adversely affect the interests of the holders of
                           Rights Certificates (other than an Acquiring Person
                           or an Affiliate or Associate of an Acquiring Person);
                           provided, however, that this Agreement may not be
                           supplemented or amended to lengthen, pursuant to
                           clause (iii) of this sentence, (A) subject to Section
                           30, a time period relating to when the Rights may be
                           redeemed at such time as the Rights are not then
                           redeemable, or (B) any other time period unless such
                           lengthening is for the purpose of protecting,
                           enhancing or clarifying the rights of, and/or the

                                       -3-
<PAGE>

                           benefits to the holders of the Rights. The foregoing
                           to the contrary notwithstanding, from and after the
                           Distribution Date, any supplement or amendment not
                           restricted only to clauses (i) and (ii) of the
                           preceding sentence shall be effective only if there
                           are Independent Directors then in office, and such
                           supplement or amendment shall also have been approved
                           by a majority of such Independent Directors. Upon the
                           delivery of a certificate from an appropriate officer
                           of the Company or, in any case where the concurrence
                           of a majority of the Independent Directors is
                           required, from the majority of the Independent
                           Directors, that states that the proposed supplement
                           or amendment is in compliance with the terms of this
                           Section 26, the Rights Agent shall execute such
                           supplement or amendment, subject to the Right Agent's
                           right to apply to counsel by the Right Agent and the
                           Right Agent being reasonably assured that such
                           supplement or amendment is no way detrimental to the
                           Right Agent's right or interest. Notwithstanding
                           anything contained in this Agreement to the contrary,
                           no supplement or amendment shall be made that changes
                           the Redemption Price, the Purchase Price, the
                           Expiration Date or the number of Units of Preferred
                           Stock for which a Right is exercisable without the
                           approval of a majority of the Independent Directors.
                           Prior to the Distribution Date, the interests of the
                           holders of Rights shall be deemed coincident with the
                           interests of the holders of Company Common Stock."

                  (7)      Amendments No. 1 and No. 2 to the Rights Agreement
are hereby rescinded and revoked in their entirety.

                  (8)      All other terms, provisions and conditions of the
Agreement remain unaltered and in full force and effect.

                                       -4-
<PAGE>

IN WITNESS WHEREOF, the parties have caused this Amendment No. 3 to be duly
executed, all as of the date first written above.

ATTEST:                                           INTERDIGITAL COMMUNICATIONS
                                                  CORPORATION

By:                                               By:
    --------------------------                       ---------------------------
    Name:                                            Name:
    Title:                                           Title:

ATTEST:                                           AMERICAN STOCK TRANSFER AND
                                                  TRUST COMPANY

By:                                               By:
    --------------------------                       ---------------------------
    Name:                                            Name:
    Title:                                           Title:

                                       -5-

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