Received December 29, 2000 From: Gib Ritenour This is to advise the IETF that Nortel Networks has filed US and international patent applications that may relate to the IETF Differentiated Services technology. Where there is a necessary dependence upon this intellectual property in implementations of Differentiated Services technology, Nortel Networks hereby agrees to license on fair, reasonable, and non-discriminatory terms to all parties, any patent claims it owns covering such technology, solely to the extent this technology is essential to comply with this standard, but on the condition that any such party grants to Nortel Networks and its corporate affiliates a reciprocal license under that party's patents for which there is also a necessary dependence. Any questions related to this statement may be addressed to: Gib Ritenour Director, Technical Standards & Patent Strategy Nortel Networks e-mail: gibr@nortelnetworks.com