Contents recorder/reproducer
US7237124B2 · kind B2 · utility
3Cited by
4References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2003 |
| Grant date | Jun 26, 2007 |
| Priority date | — |
| Expiry date | Apr 2, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A unidirectional function circuit generates a first encryption key according to the device identification information stored in a device identification information holding unit. Another unidirectional function circuit generates a second encryption key that depends on a write block address. A contents key generator generates a contents key using the first encryption key, second encryption key, and relation information. An encryptor records contents, which are encrypted using the contents key, onto a HDD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.