Method and apparatus for controlling access to digital signals
US5504816A · kind A · utility
131Cited by
13References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1994 |
| Grant date | Apr 2, 1996 |
| Priority date | — |
| Expiry date | Feb 2, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/63345
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus are provided for controlling access to digital signals sent via a first communication path and retransmitted over a second communication path. The digital signals, having been encrypted by a first encryption scheme and sent over the first communication path, are received and decrypted. The decrypted signals are then retransmitted over the second communication path using a second encryption scheme that differs from the first encryption scheme.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.