The following was received February 23, 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 believes it owns at least one patent that may relate to Internet Draft document "draft-mogul-http-delta-07.txt", including United States Patent No. 5,931,904. To the extent that the technology discussed in that Internet Draft becomes an IETF Standard and to the extent claims of AT&T's patents are required to implement the IETF Standard, AT&T agrees that, upon written request, AT&T will offer, on a nondiscriminatory basis, non-exclusive, royalty-free licenses under such patent claims to implement that 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, Bldg. 104 180 Park Avenue Florham Park, NJ 07932