Optical recording medium and the reproducing apparatus for the optical recording medium
US5538773A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 1994 |
| Grant date | Jul 23, 1996 |
| Priority date | — |
| Expiry date | Jun 28, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention discloses an optical recording medium having copy protection measures, production method thereof and a reproducing apparatus therefor. The optical disc comprises a data recording area recorded with ciphered digital signals and a cipher key information recording area provided other than the data recording area in the optical recording medium for recording cipher key information to determine a deciphering method of the ciphered digital signals. The cipher key information is provided along a peripheral edge surface which is outside the surface of the optical recording medium in a serrated pattern, perpendicular to the surface having the recording layer. The serrated pattern is formed by an injection molding machine using a metal mold having an injection molding member provided with a serrated negative pattern in accordance with the recording cipher key information to be recorded. The ciphered digital signals and the cipher key information are respectively read out from the optical recording medium by a reproducing device and the ciphered digital signals obtained are deciphered by a deciphering device using the cipher key information obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.