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