Received June 29, 2001 From: "Frost, Thomas F (Tom), ALCOO" This declaration is being made pursuant to the provisions of IETF IPR Policy, Sections 10.3.1 and 10.3.2. This is to advise the IETF that AT&T owns copyrights in the Internet Draft document "draft-korn-vcdiff-02.txt" and, to the extent that the technology discussed in such Internet Draft document becomes an IETF Standard, AT&T agrees that upon written request AT&T will offer, on a nondiscriminatory, royalty-free basis, non-exclusive licenses for prospective licensees to transmit data over the Internet under HTTP 1.1 in accordance with such IETF Standard. AT&T's willingness to grant such licenses is conditioned upon the prospective licensee granting a reciprocal license to AT&T under any patents that the prospective licensee has to any technology required to implement that IETF Standard. Written requests for licenses may be sent to: AT&T Intellectual Property Licensing Room 2E37, Building 104 180 Park Avenue Florham Park, NJ 07932