Method and apparatus for controlling the operation of a signal decoder in a broadcasting system
US6021197A · kind A · utility
61Cited by
11References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1996 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | Jun 18, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a method and apparatus for controlling the operation of a signal decoder in a broadcasting system, a broadcast signal and an encrypted signature are generated and the signature is added to the signal. The signal together with the signature is broadcasted and received in the decoder, where the signature is decrypted and compared with a verification value. If a match occurs, further operation of the decoder is allowed. If a match does not occur, further operation of the decoder is disallowed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.