Methods and apparatus for thwarting watermark detection circumvention
US8340348B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2011 |
| Grant date | Dec 25, 2012 |
| Priority date | — |
| Expiry date | Sep 28, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3233
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus for thwarting circumvention of watermark detection are provided. When content is received at a device that is equipped with a watermark extractor, an attacker may disguise the form of the received content in an attempt to circumvent detection of watermarks that are embedded in the content. A signal processing operation is performed on the received content such that the signal processing operation does not significantly degrade the perceptual quality of the content if the content is indeed in the form that is purported to be. The signal processing operation, however, significantly degrades the perceptual quality of the content if the content is in a different form, thereby discouraging the attacker's attempts to thwart watermark detection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.