Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6643384 | WATERMARK DATA HIDING APPARATUS, A METHOD OF HIDING WATERMARK DATA, A METHOD OF TRANSMITTING DATA INCLUDING WATERMARK DATA, A RECORDING MEDIUM STORING DATA INCLUDING WATERMARK DATA, A DATA AND WATERMARK DATA READING APPARATUS, AND A METHOD OF READING DATA AND WATERMARK DATA | Kazuo Hikawa | 2003-11-04 |
| 6636617 | Method and apparatus for inserting and extracting watermark into and from contents information | Takayuki Sugahara | 2003-10-21 |