Optical disc, illegal copy finding system and method using optical disc, optical disc manufacturing apparatus and optical disc manufacturing method
US7748050B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 16, 2005 |
| Grant date | Jun 29, 2010 |
| Priority date | — |
| Expiry date | Apr 24, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/00086
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disc manufacturing apparatus (46) recording a BCA code constituted by plural marks and including a secret code which is modulated in a range capable of recognizing a position in a radial direction of an optical disc and/or a position in a track direction of the plural marks as the BCA code, a BCA history database (44) storing a history including a correspondence between the BCA code of an optical disc (1a) recording the BCA code and the secret code, and a management center (30) reading the BCA code and the secret code recorded on the optical disc so as to compare both on the basis of input of the correspondence between the BCA code and the secret code stored in the BCA history database (44) are employed, whereby an illegally manufactured optical disc (1z) can be easily found by inspecting the recorded BCA code and secret code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.