Issued Patents All Time
Showing 26–50 of 92 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7542568 | Encryption device a decrypting device a secret key generation device a copyright protection system and a cipher communication device | Motoji Ohmori, Takahiro Nagai, Hideshi Ishihara | 2009-06-02 |
| RE40710 | Data converter for performing exponentiation in polynomial residue class ring with value in finite field as coefficient | Masato Yamamichi, Motoji Ohmori, Makoto Usui, Kaoru Yokota | 2009-05-12 |
| 7505584 | Contents management method, contents management apparatus, and recording medium | Toru Kamibayashi, Taku Kato, Hideyuki Toma, Shunji Harada, Hisashi Yamada | 2009-03-17 |
| 7503066 | Deactivation system | Natsume Matsuzaki | 2009-03-10 |
| 7484090 | Encryption apparatus, decryption apparatus, secret key generation apparatus, and copyright protection system | Motoji Ohmori, Hideshi Ishihara, Toshihisa Nakano | 2009-01-27 |
| 7471792 | Key agreement system, shared-key generation apparatus, and shared-key recovery apparatus | Masato Yamamichi, Motoji Ohmori, Yuichi Futa | 2008-12-30 |
| 7426494 | Rental system | Motoji Ohmori, Yuichi Futa | 2008-09-16 |
| 7404076 | Encrypted data delivery system | Toshihisa Nakano, Motoji Omori | 2008-07-22 |
| 7400725 | Information recording medium for recording a scrambled part of content information, and method and apparatus for reproducing information recorded therein | Takashi Yumiba, Hideshi Ishihara, Yoshihisa Fukushima, Kaoru Yokota | 2008-07-15 |
| 7394902 | Encryption apparatus, decryption apparatus and encryption system | Masato Yamamichi, Yuichi Futa, Motoji Ohmori | 2008-07-01 |
| 7395425 | Data protection system that protects data by encrypting the data | Toshihisa Nakano, Motoji Ohmori, Natsume Matsuzaki | 2008-07-01 |
| 7392225 | Revocation information updating method, revocation information updating apparatus and storage medium | Shunji Harada, Masayuki Kozuka, Teruto Hirota, Toru Kamibayashi, Masafumi Tamura | 2008-06-24 |
| 7386618 | Distribution system, distribution apparatus, and reception apparatus for distributing contents having usage expiry | Yuichi Futa, Motoji Ohmori, Masaya Yamamoto | 2008-06-10 |
| 7386126 | Content protection system, key data generation apparatus, and terminal apparatus | Toshihisa Nakano, Motoji Ohmori, Natsume Matsuzaki, Naoki Yamamoto, Hideshi Ishihara | 2008-06-10 |
| 7373503 | Public key certificate revocation list generation apparatus, revocation judgement apparatus, and authentication system | Toshihisa Nakano, Motoji Ohmori, Hideshi Ishihara | 2008-05-13 |
| 7359511 | Encryption transmission system | Natsume Matsuzaki, Toshiro Nishio, Hidekazu Suzuki | 2008-04-15 |
| 7298845 | Digital content protection system | Yutaka Nakamura, Shunji Harada, Masayuki Kozuka | 2007-11-20 |
| 7296147 | Authentication system and key registration apparatus | Natsume Matsuzaki, Kaoru Yokota, Yuichi Futa, Motoji Ohmori, Hirohito Kitatora | 2007-11-13 |
| 7272229 | Digital work protection system, key management apparatus, and user apparatus | Toshihisa Nakano, Natsume Matsuzaki | 2007-09-18 |
| 7254705 | Service providing system in which services are provided from service provider apparatus to service user apparatus via network | Kaoru Yokota, Motoji Ohmori | 2007-08-07 |
| 7246247 | Secure device | Natsume Matsuzaki, Kazuo Sakushima | 2007-07-17 |
| 7233662 | Numerical array output device, a numerical array output method, an encryption device, and a decryption device | Yuichi Futa, Motoji Ohmori, Kaoru Yokota | 2007-06-19 |
| 7206412 | Reception terminal, key management apparatus, and key updating method for public key cryptosystem | Kaoru Yokota | 2007-04-17 |
| 7181008 | Contents management method, content management apparatus, and recording medium | Toru Kamibayashi, Taku Kato, Hideyuki Toma, Shunji Harada, Hisashi Yamada | 2007-02-20 |
| 7155607 | Method for authentication between apparatuses using challenge and response system | Kaoru Yokota, Motoji Ohmori | 2006-12-26 |