The Public Patent Foundation's Statement about possible IPR claimed in RFC 2462 and RFC 2464 belonging to Microsoft Corporation Date: 24 October 2005 From: Dan Ravicher Dear IETF: Pursuant to IETF RFC 3979 Section 6.1.3, the Public Patent Foundation ("PUBPAT") hereby notifies IETF of the existence of intellectual property rights that may relate to technology described in IETF documents. Specifically, U.S. Patent No. 6,101,499 ("the '499 patent") owned by Microsoft Corporation may relate to RFC 2462 - IPv6 Stateless Address Autoconfiguration and RFC 2464 - Transmission of IPv6 Packets over Ethernet Networks (collectively referred to as "IPv6"). Although IETF was previously notified of the '499 patent with respect to IPv4 related documents (see http://www.ietf.org/ietf/IPR/MICROSOFT-499.txt and https://datatracker.ietf.org/public/ipr_detail_show.cgi?ipr_id=554), the '499 patent's claims, including for example claims 1 and 30, could possibly be read as also relating to IPv6. However, other than identifying this potential relationship, PUBPAT takes no position regarding the validity or scope of the '499 patent. If we can provide any further information or be of any other assistance to IETF in its review of this matter, please do not hesitate to contact me. Sincerely, Daniel B. Ravicher Executive Director Public Patent Foundation 1375 Broadway, Suite 600 New York, NY 10018 (212) 796-0571 direct (212) 796-0570 main (212) 591-6038 fax ravicher@pubpat.org www.pubpat.org