Conditional access system enabling partial viewing
US6920222B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Aug 18, 2000 |
| Grant date | Jul 19, 2005 |
| Priority date | — |
| Expiry date | Jan 28, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4623
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A conditional access system includes an EMM (Entitlement Management Message) analyzer for retrieving partial viewing authorization information. When the partial viewing authorization information permits partial viewing, ECM (Entitlement Control Message) is decrypted using work keys, and scrambling keys are intermittently retrieved from the ECM. This can solve a problem of a conventional conditional access system in that an unauthorized user's receiver cannot display pictures at all because the receiver cannot retrieve scrambling keys, and hence the user cannot enjoy a program even to such a degree as to perceive its feeling as in analog broadcasting systems, and thus the user cannot decide as to whether to make contract or not with viewing the program to some extent, which prevents the provider of the program from offering effective invitation to the user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.