Optical disc, and recording apparatus, recording method, and reproducing apparatus for the same
US6735160B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2000 |
| Grant date | May 11, 2004 |
| Priority date | — |
| Expiry date | May 31, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1403
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disc recording apparatus records a digital content onto an optical disc so that the perfect copying of the digital content is difficult without proper authorization. The optical disc recording apparatus includes a formatter for generating a channel signal corresponding to primary digital information, a secret key storing unit for prestoring secondary digital information, a pseudo random number generator for generating a pseudo random number series, an XOR for logically inverting the pseudo random number series according to each bit of the secondary digital information, a PE modulator for generating a PE modulation signal according to the logically inverted pseudo random number series, a phase modulator for modulating the phase of each edge of the channel signal by a fixed slight time according to the value of the PE modulation signal, and a recording channel for forming recording marks on a DVD according to the modulated channel signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.