Method and system for sustainable digital watermarking
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United States of America Patent
Stats
-
Jul 1, 2008
Grant Date -
Jan 27, 2005
app pub date -
Jun 10, 2002
filing date -
Jun 8, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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