Digital signal storing apparatus and method, program recording medium, digital signal recording apparatus and method
US6636690B1 · kind B1 · utility
2Cited by
5References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1999 |
| Grant date | Oct 21, 2003 |
| Priority date | — |
| Expiry date | Nov 16, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/00086
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To prevent fraudulent innumerable copies of a copyrighted digital signal from appearing, a dedicated device driver reads the copyrighted digital signal from a card type recording medium, for example, a copy bit flag is added to the digital signal thus read, the copy bit flag indicating that there exists no digital signal identical to the original digital data, and the digital signal having the copy bit flag added thereto is stored into a hard disc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.