Reception apparatus for authenticated access to coded broadcast signals
US6473742B1 · kind B1 · utility
3Cited by
10References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 25, 1998 |
| Grant date | Oct 29, 2002 |
| Priority date | — |
| Expiry date | Mar 25, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/601
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Decoding of a broadcast signal is enabled only if it carries an identifier verified by its presence (or absence) in a stored list. The list is loaded from a removable module. Preferably the loading of the list is conditional upon the success of a cryptographically authenticated exchange of signals between the module and the main part of the receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.