Dynamic relocation of the service data channel
US5870472A · kind A · utility
2Cited by
13References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1996 |
| Grant date | Feb 9, 1999 |
| Priority date | — |
| Expiry date | Nov 12, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/16
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for preventing unauthorized descrambling of cable programming includes selective relocation of the service data channel within the vertical blanking interval thereby preventing unauthorized descrambling of programming by conventional descramblers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.