Security device and head end in conditional access system and method for controlling illegal use in the system
US7810113B2 · kind B2 · utility
1Cited by
1References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2006 |
| Grant date | Oct 5, 2010 |
| Priority date | — |
| Expiry date | Jan 12, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4181
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A security device and a head end of a conditional access system (CAS), and a method for controlling illegal use of the conditional access system, capable of minimizing the number of entitlement management messages (EMMs) to be distributed from a head end to a user are provided. Update keys encrypted with user keys and channel management keys encrypted with the update keys are utilized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.