Title: Certicom's Statement About IPR Claimed in RFC 3526, RFC 2409, draft-ietf-ipsec-ikev2, and Other IETF Specifications Using MODP Groups Received: 4 February 2004 From: Tony Rosati Dear Sir or Madam: We wish to advise the IETF that Certicom believes it has rights under patents and pending applications that relate to RFC 3526 "More Modular Exponential (MODP) Diffie-Hellman Groups for Internet Key Exchange (IKE)", RFC 2409 "Internet Key Exchange", Internet Draft (draft-ietf-ipsec-ikev2-12.txt) "Internet Key Exchange (IKEv2) Protocol" and other IETF specifications using MODP Groups (individually and collectively the "IKE Specifications"). The applicable patents and applications include, but are not limited to, US Patents #5,933,504, #6,563,928, #6,078,667, #6,178,507, #6,195,433, US Patent Application Publications #2001/0014153, #2002/0090085, #2001/0021256, and any corresponding foreign applications. Certicom will, upon written request, provide a nonexclusive, royalty-free patent license, with reasonable terms and conditions, under those patents issued to Certicom that contain claims essential to the IKE Specifications and for which Certicom is able to provide patent licenses, within the limited field of use of MODP public key cryptography implemented using the well known Groups 1 and 2 as defined in RFC 2409. This patent license is available to all entities willing to grant Certicom a reciprocal license. Any party wishing to request a patent license should write to: Tony Rosati VP of Intellectual Property & Licensing Certicom Corp. 5520 Explorer Drive, 4th Floor Mississauga, ON L4W 5L1 Tel:(613) 254-9265 email: trosati@certicom.com