Copy prevention method and apparatus for digital video system
USRE39319E1 · kind E1 · reissue
6Cited by
28References
32Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 17, 2003 |
| Grant date | Oct 3, 2006 |
| Priority date | — |
| Expiry date | Dec 17, 2023 |
Classification
- Technology area (CPC —)General
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: stream; (b) decrypting and transmitting the bit stream to which the header area is added: 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 from stop step (c) and optionally recording it an on a tape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.