Issued Patents All Time
Showing 51–75 of 92 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7155610 | Cryptocommunication system, transmission apparatus, and reception apparatus | Masato Yamamichi, Yuichi Futa, Motoji Ohmori | 2006-12-26 |
| 7137012 | Storage medium and contents protection method using the storage medium | Tooru Kamibayashi, Hisashi Yamada, Hiroshi Iwasaki, Masafumi Tamura, Yasuhiro Ishibashi +3 more | 2006-11-14 |
| 7120251 | Data player, digital contents player, playback system, data embedding apparatus, and embedded data detection apparatus | Hirotsugu Kawada, Noboru Katta, Susumu Ibaraki, Shunji Harada | 2006-10-10 |
| 7065648 | Mutual authentication method, recording apparatus, reproducing apparatus, and recording medium | Tooru Kamibayashi, Hisashi Yamada, Hiroshi Iwasaki, Masafumi Tamura, Yasuhiro Ishibashi +2 more | 2006-06-20 |
| 7062652 | Semiconductor memory card, data reading apparatus and data reading/reproducing apparatus | Teruto Hirota, Taihei Yugawa, Masataka Minami, Masayuki Kozuka | 2006-06-13 |
| 7023362 | Positional information storage system and method, semiconductor memory, and program | Yuichi Futa, Motoji Ohmori | 2006-04-04 |
| 6995692 | Data converter and method thereof | Masato Yamamichi, Motoji Ohmori, Makoto Usui, Kaoru Yokota | 2006-02-07 |
| 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 |
| 6789192 | Semiconductor memory card, data reading apparatus, and data reading/reproducing apparatus | Teruto Hirota, Taihei Yugawa, Masataka Minami, Masayuki Kozuka | 2004-09-07 |
| 6687683 | Production protection system dealing with contents that are digital production | Shunji Harada, Masayuki Kozuka, Masataka Minami | 2004-02-03 |
| 6654883 | Device authentication and encrypted communication system offering increased security | — | 2003-11-25 |
| 6606707 | Semiconductor memory card | Teruto Hirota, Taihei Yugawa, Masataka Minami, Masayuki Kozuka | 2003-08-12 |
| 6581160 | Revocation information updating method, revocation information updating apparatus and storage medium | Shunji Harada, Masayuki Kozuka, Teruto Hirota, Toru Kamibayashi, Masafumi Tamura | 2003-06-17 |
| 6550009 | Encryption system for distributing a common crypt key | Sachiko Uranaka, Masaki Kiyono | 2003-04-15 |
| 6539468 | Data copying system, data copying method, data reading apparatus, data writing apparatus and data recording medium | Mitsuhiro Inoue, Shunji Harada, Masayuki Kozuka, Yoshihisa Fukushima, Mitsuhiko Serikawa | 2003-03-25 |
| 6496930 | Message receiving apparatus and message transmitting apparatus | Takatoshi Ono, Takeshi Saijo, Syunji Harada, Yasuo Okumura | 2002-12-17 |
| 6459792 | Block cipher using key data merged with an intermediate block generated from a previous block | Motoji Ohmori, Natsume Matsuzaki, Masakatsu Maruyama | 2002-10-01 |
| 6359986 | Encryption system capable of specifying a type of an encrytion device that produced a distribution medium | — | 2002-03-19 |
| 6289314 | Pay information providing system for descrambling information from plural sources and rescrambling the information before sending to a terminal or terminals | Natsume Matsuzaki, Motoji Ohmori | 2001-09-11 |
| 6289102 | Apparatus and method for preventing unauthorized use of information recorded on an information recording medium | Hiroshi Ueda, Yoshihisa Fukushima, Motoshi Ito, Natsume Matsuzaki | 2001-09-11 |