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Intellectual Property Information

NTT grants non-exclusively royalty-free licenses of the essential patents for Camellia, PSEC-KEM, ESIGN and EPOC in order to establish a leadership role toward achieving a low-cost secure advanced telecommunication society through the proliferation and promotion of encryption technologies that contribute to the construction of an environment in which various security products and services can be used widely.
(The essential patents for Camellia are the common properties of NTT and Mitsubishi Electric Corporation, and Mitsubishi has agreed with NTT's this decision.)
<News Release for Announcement of Royalty-free Licenses for Essential Patents>

From April 13, 2006, NTT begins to publish NTT's open source codes of Camellia, which was already adopted as major international standardization specifications and recommended specifications of encryption algorithms, with free of charge by multiple open source software licenses. This is based on a policy of spreading further the use of Camellia as an international infrastructure technology to support securely advanced information society as the first Japanese encryption algorithm.
Up until now, NTT and Mitsubishi prepare the royalty-free licensing agreement for jointly owned Camellia essential patents mainly for industrial enterprises and corporations that develop products incorporating Camellia. Hereafter, however, in accordance with an agreement between NTT and Mitsubishi, Camellia essential patents can be used at no charge by any Camellia user without concluding such royalty-free licensing agreement hereafter.
Of course, if there is your request, patent execution consent from NTT and Mitsubishi based on the royalty-free licensing agreement for essential patents can be obtained in the same way as up to now. For details, please contact the NTT Intellectual Property Center.
<News Release for Announcement of Camellia Open Source>

<<<Important Notice>>>

  1. However, in regard to the manufactured products of each manufacturer that support the encryption technology developed by NTT (in regard to Camellia, Mitsubishi Electric Corporation is included), NTT does not guarantee implicitly or explicitly the performance, quality, marketability, applicability to a specific use, or the impossibility of successful attacks on the encryption algorithm.
  2. In regard to applying the open source software, although these are programmed so that it performs correct encryption and decryption based on the Camellia’s specifications and high-speed processing method for 32-bit CPUs, the modes of operation, a key management mechanism, and counter-measure technology for implementation attacks are not included, and the appropriate care should be taken. In addition, in the event that this open source software should yield any kind of damage, this software should be used with the understanding that NTT does not bear any responsibility whatsoever.
  3. Any product equipped with one or more of the above-mentioned encryption algorithms (including the open sources) is a controlled product regulated under the Japanese Foreign Exchange and Foreign Trade Law, though the algorithms are public. When you plan to export or take this product out of Japan, or provide any juridical person having its main office in Japan, concerning property or business of such a juridical person which is located overseas, please obtain a permission, as required by the Law and related regulations, from the Japanese Government.

* Camellia is a registered trademark of Nippon Telegraph and Telephone Corporation and Mitsubishi Electric Corporation.


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