Exhibit 99.1

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of InterDigital Communications
Corporation (the "Company") for the year ended December 31, 2002 as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I,
Howard E. Goldberg, President and Chief Executive Officer of the Company, hereby
certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906
of the Sarbanes-Oxley Act of 2002, that:

     (1) The Report fully complies with the requirements of Section 13(a) or
15(d) of the Securities Exchange Act of 1934, as amended; and

     (2) The information contained in the Report fairly presents, in all
material respects, the financial condition and results of operations of the
Company.


Date: March 31, 2003                       /s/ Howard E. Goldberg
                                           -------------------------------------
                                           Howard E. Goldberg
                                           President and Chief Executive Officer

*    A signed original of this written statement required by Section 906 has
     been provided to the Company and will be retained by the Company and
     furnished to the Securities and Exchange Commission or its staff upon
     request.

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