Issued Patents All Time
Showing 151–174 of 174 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7693795 | Digital work protection system | Masato Yamamichi, Natsume Matsuzaki, Toshihisa Abe, Masaya Miyazaki | 2010-04-06 |
| 7657739 | Authentication system | Makoto Tatebayashi, Hideshi Ishihara | 2010-02-02 |
| 7647646 | Information input/output system, key management device, and user device | Motoji Ohmori, Makoto Tatebayashi, Hideshi Ishihara | 2010-01-12 |
| 7644446 | Encryption and data-protection for content on portable medium | Clifford P. Strom, Ian Cameron Mercer, James M. Alkove, Jeffrey R. McKune, Kevin Leigh LaChapelle +3 more | 2010-01-05 |
| 7620993 | Copyright protection system, key generation apparatus, recording apparatus, reproduction apparatus, read-out apparatus, decryption apparatus, recording medium, recording method and program | Naoki Yamamoto, Hideshi Ishihara, Makoto Tatebayashi | 2009-11-17 |
| 7617536 | Unauthorized device detection device, unauthorized device detection system, unauthorized device detection method, program, recording medium, and device information update method | Masao Nonaka, Yuichi Futa, Motoji Ohmori, Takeshi Gomi, Kazukuni Kobara +1 more | 2009-11-10 |
| 7567487 | Content moving device, content moving method, computer program, recording medium, and content moving system | Yoshikatsu Ito, Masaya Miyazaki, Motoji Ohmori, Shunji Harada, Kaoru Yokota +1 more | 2009-07-28 |
| 7555779 | Copyright protection system, recording device, and reproduction device | Shunji Harada, Natsume Matsuzaki, Makoto Tatebayashi | 2009-06-30 |
| 7549061 | Unauthorized contents detection system | Masao Nonaka, Yuichi Futa, Kaoru Yokota, Motoji Ohmori, Masaya Miyazaki +3 more | 2009-06-16 |
| 7484090 | Encryption apparatus, decryption apparatus, secret key generation apparatus, and copyright protection system | Motoji Ohmori, Makoto Tatebayashi, Hideshi Ishihara | 2009-01-27 |
| 7441117 | Group formation/management system, group management device, and member device | Natsume Matsuzaki, Toshihisa Abe, Yuichi Futa, Masaya Miyazaki | 2008-10-21 |
| 7404076 | Encrypted data delivery system | Motoji Omori, Makoto Tatebayashi | 2008-07-22 |
| 7395425 | Data protection system that protects data by encrypting the data | Motoji Ohmori, Natsume Matsuzaki, Makoto Tatebayashi | 2008-07-01 |
| 7386126 | Content protection system, key data generation apparatus, and terminal apparatus | Motoji Ohmori, Natsume Matsuzaki, Makoto Tatebayashi, Naoki Yamamoto, Hideshi Ishihara | 2008-06-10 |
| 7373503 | Public key certificate revocation list generation apparatus, revocation judgement apparatus, and authentication system | Motoji Ohmori, Makoto Tatebayashi, Hideshi Ishihara | 2008-05-13 |
| 7308583 | Data distribution system | Natsume Matsuzaki, Tsutomu Matsumoto | 2007-12-11 |
| 7287690 | Value holding system, value holding method, value holding program, and transaction system | Motoji Ohmori | 2007-10-30 |
| 7272229 | Digital work protection system, key management apparatus, and user apparatus | Natsume Matsuzaki, Makoto Tatebayashi | 2007-09-18 |
| 7184035 | Image display system and display device | Yuji Sato, Akihiko Inoue, Tomoyuki Ishihara | 2007-02-27 |
| 7167559 | Information security device, exponentiation device, modular exponentiation device, and elliptic curve exponentiation device | Takatoshi Ono, Natsume Matsuzaki | 2007-01-23 |
| 7051924 | Value holding system, value holding method, value holding program, and transaction system | Motoji Ohmori | 2006-05-30 |
| 6941385 | Server transferring only image display data for a part of a display image which is to be updated for associated terminals | Tomoyuki Ishihara, Akihiko Inoue, Yuji Sato | 2005-09-06 |
| 6864884 | Synchronization signal generation circuit, image display apparatus using synchronization signal generation circuit, and method for generating synchronization signal | Akihiko Inoue, Yuji Sato, Tomoyuki Ishihara | 2005-03-08 |
| 5677838 | Faulty operation prevention circuit of a computer | Keiji Itou, Kiyotaka Sugiura, Masaki Itou, Takashi Noguchi | 1997-10-14 |