Method and a system for receiving a multimedia signal, a cryptograophic entity for said reception method and system, and a method and a black box for producing said cryptographic entity
US8666072B2 · kind B2 · utility
0Cited by
6References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 14, 2006 |
| Grant date | Mar 4, 2014 |
| Priority date | — |
| Expiry date | Sep 15, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/63345
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This method of receiving a multimedia signal scrambled by means of a control word uses a first cryptographic entity that can be connected to any one of P second cryptographic entities to form part of a device for receiving the scrambled multimedia signal. Only second cryptographic entities of a group of N second cryptographic entities selected from a wider set of P second cryptographic entities use a session key obtained by diversifying a root key identical to the root key used to obtain the session key of the first cryptographic entity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.