Received May 23, 2001 Nippon Telegraph and Telephone Corporation and Mitsubishi Electric Corporation (hereinafter refers as "Parties") believe to hold granted patents and/or pending application (hereinafter refers as "Patents"), which is/are essential to implement Camellia. On condition that other company and/or entity shall grant their patents essentially required to IETF Transport Layer Security standard (hereinafter refers as "Standard") under fair and commercially reasonable terms and conditions on non-discriminatory basis in accordance with RFC 2026, Parties hereby declare that, to the extent that Patents are essential to Camellia, Parties are prepared to grant, on the basis of reciprocity and non-discriminatory for Standard, a royalty-free license under Patents to an unrestricted number of applicants throughout the world to manufacture, use and/or sell implementations of Camellia with respect to the application area of the Standard. Notwithstanding the foregoing, Parties shall reserve any and all rights to enforce Patents against any applicant in the event that such applicant assert any patent related to cryptographic technology which is essentially required to products fully complied with Standard. Sincerely, Takashi Sawai General Manager, Intellectual Property Center Nippon Telegraph and Telephone Corporation 9-11, Midori-Cho 3-Chome Musashino-Shi, Tokyo, 100-8310, Japan Suketaka Tachibana General Manager, Corporate Licensing Department Mitsubishi Electric Corporation 2-2-3, Marunouchi Chiyoda-ku, Tokyo 180-8585 Japan