Issued Patents 2002
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6490683 | Optical disk having electronic watermark, reproducing apparatus thereof and copy protecting method using the same | Hisashi Yamada, Hideo Ando, Kouichi Hirayama | 2002-12-03 |
| 6397366 | Data transmission system, data recording and reproducing apparatus and recording medium each having data structure of error correcting code | Shin-ichi Tanaka, Masatoshi Shimbo, Shinya Yamada, Koichi Hirayama | 2002-05-28 |
| 6360055 | Information storage medium, recording method used therefor and reproducing apparatus | Toshihiko Kaneshige, Sigeru Todokoro | 2002-03-19 |
| 6347145 | Method and apparatus of enciphering and deciphering data using keys enciphered and deciphered with other keys | Takehisa Kato, Naoki Endoh, Hiroaki Unno, Koichi Hirayama | 2002-02-12 |
| 6338139 | Information reproducing apparatus, authenticating apparatus, and information processing system | Hideo Ando, Masaki Nakagawa, Yoshiyuki Ishizawa | 2002-01-08 |