Recording medium, content player, content player method, and computer program
US7761707B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2005 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | Nov 24, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/00695
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To provide a recording medium on which an entire piece of decryption information that is required to be highly secure is recorded while being kept secure even when it is larger in data size than the storage capacity of an area originally intended for recording it.A recording medium in which encrypted content that has been encrypted and decryption information for the decryption of the encrypted content are recorded in two areas of different security levels. Decryption information B which is a portion of the decryption information is recorded in an area L of a relatively higher security level. The encrypted content and decryption information C which is the remainder of the decryption information that has been encrypted are recorded in an area D of a relatively lower security level. The decryption information B recorded in the area L includes information indicating the location where the decryption information C is recorded and information for the decryption of the remainder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.