Optical disk having electronic watermark, reproducing apparatus thereof and copy protecting method using the same
US6490683B1 · kind B1 · utility
136Cited by
9References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1998 |
| Grant date | Dec 3, 2002 |
| Priority date | — |
| Expiry date | Sep 8, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1833
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A copy protecting method for an optical medium includes a writing step of writing watermark data as ECC data in a data storage area of a disk having a certain data stored therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.