Magneto-optical recording medium having watermark for preventing unauthorized copy
US7414924B2 · kind B2 · utility
2Cited by
25References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 9, 2005 |
| Grant date | Aug 19, 2008 |
| Priority date | — |
| Expiry date | Jun 4, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1245
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk that includes main information and write-once information recorded on the optical disk. The write-once information is recorded as information unique to the optical disk, and the write-once information stores at least watermark production parameters for producing a watermark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.