Optical disk, optical recorder, optical reproducer, crytocommunication system and program license system
US6081785A · kind A · utility
125Cited by
4References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1997 |
| Grant date | Jun 27, 2000 |
| Priority date | — |
| Expiry date | Jun 9, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2562
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The operating and other procedures of an optical disk application system of the type for which a network is used are simplified. Optical disks have auxiliary data recording areas, where different IDs for individual disks, and/or cipher keys and/or decoding keys for ciphers are recorded in advance in a factory. By using the IDs to release the soft ciphers, using the cipher keys when sending the ciphers, and using the decoding keys when receiving the ciphers, user authorization procedures are simplified.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.