System and method for controlling copying and playing of digital programs
US5896454A · kind A · utility
128Cited by
6References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1996 |
| Grant date | Apr 20, 1999 |
| Priority date | — |
| Expiry date | Mar 8, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2005/91328
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method for preventing effective copying of digital recordings. A copy-state code accompanies each recording, one state of which represents that no copies at all are to be made of the recording. Compatible players are designed to prevent play of any writable disk which includes a "no-copy" code. It is the inconsistency between the code and the medium containing it that causes play of the medium to be inhibited.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.