Illegal view and copy protection method in digital video system and controlling method thereof
US5757909A · kind A · utility
122Cited by
4References
35Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 22, 1995 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | Nov 22, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2005/91364
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Illegal view and copy protection method in a digital video system for preventing an illegal user from viewing the digital video system and copying therefrom, by setting a descrambling method which decrypts split keystreams adopting a smart card, including a determination step for determining received data of having been scrambled; a reproduction step, a recording step, and a transporting step, wherein the reproduction step, the recording step and the transporting step can be performed simultaneously or selectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.