Method and devices for copy protection, copy protected record carrier
US8441898B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 13, 2012 |
| Grant date | May 14, 2013 |
| Priority date | — |
| Expiry date | Feb 13, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2562
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for copy protection includes providing audiovisual or audio data stored in sectors of a record carrier having a file system, and providing additional or modified data to be stored in further sectors. The method includes generating a first file of the file system referencing at least a part of the sectors and none of the further sectors, so when the first file is rendered by a playback device, the data is reproduced which is included in the part of the sectors. The method also includes generating a second file of the file system being another file than the first file and referencing at least a part of the sectors and further referencing at least one of the further sectors, such that when the second file is rendered by the playback device the part of the sectors and the at least one of the further sectors are reproduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.