Efficient distribution of encrypted content for multiple content access systems
US7787622B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 2003 |
| Grant date | Aug 31, 2010 |
| Priority date | — |
| Expiry date | Apr 30, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/43607
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method for digital data distribution is disclosed. The system and method provides a set of one or more source streams encoded by an encoder to form a common data stream for distribution to a plurality of destination systems, each authorized to access at least a portion of the common data stream. Encryption comprises obtaining the source stream, identifying some blocks of the source stream as secure blocks, identifying some other blocks of the source stream as unsecured blocks, encrypting the secure blocks for each of a plurality of destination system classes wherein each of the plurality of destination systems is a member of one or more destination system classes, and each of the blocks of an encrypted secure block set is decryptable by destination systems in the class associated with that encrypted secure block set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.