Encoding and recording apparatus, playback apparatus, and program
US8204226B2 · kind B2 · utility
3Cited by
1References
17Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Apr 18, 2005 |
| Grant date | Jun 19, 2012 |
| Priority date | — |
| Expiry date | Apr 18, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/60
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention relates to an encoding and recording apparatus, a playback apparatus, and a program which solve the possibility of a capacity shortage of a protected area accompanying an increase in an information amount and the number of content keys. It is configured such that an encoded user identifier is recorded in a protected area of a key storage medium. The encoded user identifier is fixed information, and has the characteristic in which a data amount is not increased in connection with a utilization form. Therefore, a capacity shortage of the protected area is not brought about.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.