Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6768709 | Hiding digital data in a digital audio or video carrier signal | Henry B. Kelly | 2004-07-27 |
| 6717899 | Optical disc hidden data technique | Henry B. Kelly | 2004-04-06 |
| 6715122 | Copy protection through symbol substitution and induced errors | Henry B. Kelly | 2004-03-30 |