Copy prevention method and apparatus for digital video system
US5761302A · kind A · utility
69Cited by
9References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 22, 1995 |
| Grant date | Jun 2, 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
A copy prevention method and apparatus for a digital video system is disclosed including the steps of: (a) adding a header area of a header start code and key field to a reproduced bit stream; (b) decrypting and transmitting the bit stream to which the header area is added; (c) detecting a key field of the decrypted and transmitted bit stream and detecting copy prevention information; and (d) encrypting the bit stream according to information detected form step (c) and recording it on tape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.