Method and equipment for allocating to a television program, which is already conditionally accessed, a complementary conditional access
US6307939A · kind A · utility
143Cited by
4References
3Claims
0Family size
Assignees
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Key dates
| Filing date | Feb 19, 1999 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Feb 19, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4623
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and an equipment for allocating to a television program, which is already conditionally accessed, a complementary conditional access. The television program is first received by means provided with access entitlements and the control words are restored. Complementary access control messages and complementary entitlement management messages corresponding to a complementary access control system are built up. The initial unmodified television program is rebroadcast, together with the complementary messages related to the complementary access control system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.