Issued Patents 2005
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6971022 | Cryptographic apparatus for performing cryptography on a specified area of content data | Noboru Katta, Susumu Ibaraki, Shinji Inoue | 2005-11-29 |
| 6917684 | Method of encryption and decryption with block number dependant key sets, each set having a different number of keys | Kaoru Yokota, Motoji Ohmori, Fumihiko Sano, Naoki Endo | 2005-07-12 |
| 6891950 | Extended key generator, encryption/decryption unit, extended key generation method, and storage medium | Motoji Oomori, Kaoru Yokota, Tsutomu Sekibe, Fumihiko Sano, Shinichi Kawamura | 2005-05-10 |
| 6862582 | Production protection system dealing with contents that are digital production | Shunji Harada, Masayuki Kozuka, Masataka Minami | 2005-03-01 |
| 6859535 | Digital content protection system | Yutaka Nakamura, Shunji Harada, Masayuki Kozuka | 2005-02-22 |
| 6850914 | Revocation information updating method, revocation informaton updating apparatus and storage medium | Shunji Harada, Masayuki Kozuka, Teruto Hirota, Toru Kamibayashi, Masafumi Tamura | 2005-02-01 |