Processing copy protection signals
US7454621B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 2002 |
| Grant date | Nov 18, 2008 |
| Priority date | — |
| Expiry date | Feb 13, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2005/91335
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method and an arrangement for recording an information signal with first copy protection information to a storage medium using recording means, the recording being performed according to first copy rules identified by the first copy protection information. The method comprises the steps of detecting said first copy protection information identifying said first copy rules, recording at least second copy protection information according to said detected first copy rules, said first and at least second copy protection information identifying a legality message to be interpreted by reading means, the at least second copy protection information changing within a predefined time interval after the change in said detected first copy rules according to an interpreting rule.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.