Method and apparatus for ensuring the copy protection of digital data
US7340778B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 24, 2002 |
| Grant date | Mar 4, 2008 |
| Priority date | — |
| Expiry date | Oct 16, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/00927
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
When digital data is to be copy protected at a processing station, for example, prior to its encoding and recording onto an optical disc, it is necessary to control a compliant encoder to utilise copy protection files to perform the copy protection routine. To ensure that the digital data is reliably copy protected, predetermined noise signals are incorporated into the digital data and the processing steps which add the copy protection are additionally caused to remove the noise signals. By this means, if the digital data is not copy protected, the noise signals remain. This enables non-copy protected digital data to be readily identified and ensures that it is effectively unusable to a consumer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.