Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6477649 | Information recording apparatus, information reproducing apparatus, and information distribution system | Toru Kambayashi, Shuichi Tsujimoto, Kazuo Sumita, Hideki Hirakawa, Toshihiro Sugaya | 2002-11-05 |
| 6463155 | Broadcast reception device and contract management device using common master key in conditional access broadcast system | Toru Kambayashi, Shuichi Tsujimoto, Naoki Endoh | 2002-10-08 |