Do I need the original unwatermarked data to extract a Giovanni watermark from a copy?
No. Unlike most other proposed digital watermark systems, all the information resides in the watermarked copy. As long as one has the Giovanni software, the encoding keys, and the copy, the watermark can be extracted. Because Giovanni is a key-based system, each copy of content watermarked with Giovanni can theoretically be encoded with a separate key. Further, each watermark message in a single media content copy may be governed by separate keys! Under this premise, alternative proposals that maintain a centralized database or predefine the actual location of watermarks are, essentially, “single-key” implementations. A single breach of the security of the single key is devastating to copyright owners (More damaging: the pirate may not disclose the breach.). The common misunderstanding is the distinction between a “random number”, and a “ciphered random key”. In the real world, this begs the question: “What if all the apartments in New York City had the same locks?” The multi-key, mult
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- Do I need the original unwatermarked data to extract a Giovanni watermark from a copy?
