Method for protecting digital content against minority collusion attacks
US8995706B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2008 |
| Grant date | Mar 31, 2015 |
| Priority date | — |
| Expiry date | Apr 11, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3284
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and system of detecting colluders conducting a collusion attack including a minority-type collusion attack on a digital product includes the generation of codewords used as watermarks in the digital product. The inner code of the codewords is generated using permutations of rows in a Hadamard matrix and concatenating them together. A typical outer code of the codeword is the Reed Solomon code. An adaptive detector is able to accurately detect one of three or more colluders of a minority-type attack. Prior art schemes using an error correcting code-based watermarking mechanism with an inner code fail to detect colluders with a minority-type collusion attack which includes three colluders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.