Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7155591 | Verifying the integrity of a media key block by storing validation data in the validation area of media | Jeffrey Bruce Lotspiech, Atsushi Ishihara, Taku Kato, Yoshihisa Fukushima | 2006-12-26 |
| 6912634 | Verifying the integrity of a media key block by storing validation data in a validation area of media | Jeffrey Bruce Lotspiech, Atsushi Ishihara, Taku Kato, Yoshihisa Fukushima | 2005-06-28 |