Optical disk, optical recorder, optical reproducer, cryptocommunication system and program license system
US6301569A · kind A · utility
14Cited by
13References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1999 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Nov 30, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2562
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A device for recording information on an optical disk having first and second recording areas, which device can record information using a first modulation method into a first recording area, read disk identification information recorded by a second modulation method in a second recording area, encrypt information using both a cipher key and disk identification information unique to the optical disk, and permit recording of such encrypted information after confirming the content of a recording permission code in an input signal for recording.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.