Issued Patents 2005
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6868404 | DIGITAL DATA RECORDING DEVICE, DIGITAL DATA MEMORY DEVICE, AND DIGITAL DATA UTILIZING DEVICE FOR CONVERTING MANAGEMENT INFORMATION WHICH CONTAINS RESTRICTIVE INFORMATION USING A DIFFERENT KEY IN EACH MANAGEMENT INFORMATION SEND/RECEIVE SESSION | Takatoshi Ono | 2005-03-15 |
| 6865552 | Data copying system, data copying apparatus, data copying method, and recording medium | Mitsuhiro Inoue, Masayuki Kozuka | 2005-03-08 |
| 6862582 | Production protection system dealing with contents that are digital production | Masayuki Kozuka, Masataka Minami, Makoto Tatebayashi | 2005-03-01 |
| 6859535 | Digital content protection system | Makoto Tatebayashi, Yutaka Nakamura, Masayuki Kozuka | 2005-02-22 |
| 6850914 | Revocation information updating method, revocation informaton updating apparatus and storage medium | Makoto Tatebayashi, Masayuki Kozuka, Teruto Hirota, Toru Kamibayashi, Masafumi Tamura | 2005-02-01 |