Received June 13, 2002 From: "Michael Luby" This letter affirms that Digital Fountain, Inc. (Digital Fountain), in accordance with long-established practice, will offer patent licenses for submissions made by it that are adopted or recommended as a standard by the IETF as follows: If part(s) of a submission by Digital Fountain is (are) incorporated in an IETF standard and Digital Fountain has patents and/or pending patent applications that are essential for the implementation of such included part(s), Digital Fountain is prepared to grant, on the basis of reciprocity (grantback), a nonexclusive license on such included part(s) on reasonable, non-discriminatory terms and conditions. For further information, please contact: Joseph Vo Assistant General Counsel Digital Fountain, Inc. 39141 Civic Center Drive Fremont, California 94538 Telephone: +1.510.284.1400 Facsimile: +1.510.284.1499