Issued Patents 2003
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6615192 | Contents copying system, copying method, computer-readable recording medium and disc drive copying contents but not a cipher key via a host computer | Kenji Tagawa, Mitsuhiro Inoue, Masayuki Kozuka, Shoichi Aoyama, Yukako Ohtani +1 more | 2003-09-02 |
| 6581160 | Revocation information updating method, revocation information updating apparatus and storage medium | Makoto Tatebayashi, Masayuki Kozuka, Teruto Hirota, Toru Kamibayashi, Masafumi Tamura | 2003-06-17 |
| 6539468 | Data copying system, data copying method, data reading apparatus, data writing apparatus and data recording medium | Mitsuhiro Inoue, Masayuki Kozuka, Makoto Tatebayashi, Yoshihisa Fukushima, Mitsuhiko Serikawa | 2003-03-25 |