Optical disc, recording device, and recording device
US7023779B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2001 |
| Grant date | Apr 4, 2006 |
| Priority date | — |
| Expiry date | Oct 13, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/284
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disc storing a copyrighted digital product has a data area in which N processed parts are provided in order to certify that the stored digital product is an original one. A BCA provided on the optical disc stores judgment criteria information as well as N pieces of physical feature information. The judgment criteria information includes a numeric value N being the total number of processed parts, and a numeric value M being an integer between 0 and N inclusive and representing the security level to be assured for the digital data stored. When a numeric value P being the total number of processed parts in a normal state exceeds the numeric value M, a reproduction device reproduces the optical disc. When the numeric value P falls short of the numeric value M, the reproduction device does not reproduce the optical disc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.