The following message was received on November 5, 1999 From: peter.hovell@bt.com Subject: Disclosure of Patents to the IETF In accordance with the IETF Rules, BT would like to disclose that we have recently applied for patents in the IPv6 space relating to: * the establishment of tunnels using DNS as the tunnel endpoint discovery mechanism and * a mechanism that enables translation and tunneling to be combined into a single device. BT does so in the belief that these recent patent application are relevant to present discussions within the IETF. Regards, Peter Peter Hovell Futures Lab B29, Room 128, Adastral Park, Martlesham Heath, IP5 3RE Tel: 01473 644208 eMail: peter.hovell@bt.com ================== British Telecommunications plc Registered Office 81 Newgate Street London EC1A 7AJ Registered in England no 1800000 ========================================================================== On November 12, 1999, the following statement was received Also in accordance with IETF Rules, BT hereby gives the assurance that, following approval by the IESG of the relevant Internet standards specification, BT will grant licences under these patent applications and under any resultant patents, on openly specified, reasonable and non-discriminatory terms, to implement the Internet standards specification, provided the licensee similarly grants licences under its necessary applications/patents. For and behalf of British Telecommunications Plc. Martin Read Head of Licensing Intellectual Property Department Group Legal Services British Telecommunications Plc 8th Floor Holborn Centre 120 Holborn London EC1N 2TE Tel: +44 171 492 8152 Fax: +44 171 242 0616 E-mail: MARTIN.2.READ@BT.COM