Descrambling of multiple television channels
US8959544B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 2013 |
| Grant date | Feb 17, 2015 |
| Priority date | — |
| Expiry date | Mar 3, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4622
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Various arrangements for descrambling multiple television channels concurrently are presented. A set-top box may receive a first plurality of television channels as scrambled data packets. A previously-received locally-stored networking information table may be accessed that associates each of the multiple television channels with the same entitlement control message, as indicated by a packet identifier. An entitlement control message having the same packet identifier may be received. A smartcard may be used to decrypt the entitlement control message having the same packet identifier to obtain a first control word and a second control word. Scrambled data packets corresponding to the multiple television channels may be descrambled using the first control word and the second control word. These television channels may be stored and/or output for presentation by the set-top box.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.