Method and system for sustainable digital watermarking
US7395433B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 2002 |
| Grant date | Jul 1, 2008 |
| Priority date | — |
| Expiry date | Oct 21, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/1063
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Digital marks (so-called fingerprints and watermarks) serve two basic purposes: (1) Investigative: the owner reads a fingerprint to determine how the marked entity leaked; and (2) Legal: the owner must prove in court that (a) there is a watermark (a concealed copyright message), and (b) it is the owner's. The main difficulty of item (2) is that the first use of the watermark software reveals the watermarking method to the public so that hostile parties are equipped to remove or damage its watermarks. The invention uses tamper-resistant software encoding techniques to protect the digital mark extractor algorithm, frustrating the attacks of hostile parties in two ways: the resulting code is obscure (that is, its inner workings are incomprehensible; and chaotic (that is, a modification at any point will almost certainly produce a nonsense program.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.