Method of protection against the unauthorized unscrambling of scrambled television broadcasts, and implementation method
US5204898A · kind A · utility
1Cited by
1References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 23, 1991 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Jul 23, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/1696
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
According to the disclosed method, decoys which are the reproduction of the corresponding interpolated sequence are inserted into the scrambled line, at the end of the first section and at the start of the second section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.