Method to secure access to audio/video content in a decoding unit
US8315392B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 2010 |
| Grant date | Nov 20, 2012 |
| Priority date | — |
| Expiry date | Jan 13, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4623
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention concerns the generation of a key necessary to decrypt audio/video contents by genuine decoding units. It concerns in particular a method to secure the reception of a broadcast content managed by a control center and encrypted by at least one content key, said content key or a data allowing to recover said content key being transmitted to the decoding units encrypted by a transmission key common to the decoding units, each decoding unit having at least one environment parameter known by the control center, said decoding unit receiving from the control center a first message common to all decoding units and comprising the encrypted transmission key and a second message, pertaining to said decoding unit and comprising correction data dedicated to said decoding unit, the decryption of the transmission key being made using the environment parameter and the correction data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.