Method and apparatus for performing session based conditional access
US7571451B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 10, 2003 |
| Grant date | Aug 4, 2009 |
| Priority date | — |
| Expiry date | Jul 29, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/6587
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video-on-demand conditional access information distribution system includes establishing a session with a set top terminal by defining an in-band communications channel for transporting content to the set top terminal, and communicating to the set top terminal via the defined in-band communications channel, an authorization message and descrambling message suitable for determining a descrambling key for descrambling a program stream. The set top terminal sends a request for content via an out of band communications channel and a scrambled program stream is provided to the set top terminal via the defined in-band communications channel. The authorization message is sent prior to the set top terminal receiving the descrambling message and the scrambled program stream, which includes video-on-demand content requested by the set top terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.