Secure Watermarking of Content
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United States of America Patent
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Issued Date -
Dec 10, 2015
app pub date -
Dec 30, 2013
filing date -
Dec 28, 2012
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Abandoned
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Abstract
Methods and systems for secure watermarking of at least part of a content item X are described, wherein the method comprises: providing a distorted content item X+y, comprising one or more distorted data units wherein the payload of a distorted data unit comprises a distortion signal y which distorts the rendering of the payload in said distorted data unit; providing a compensating watermark payload w-y comprising one or more compensating watermark signals S−y; using homomorphic encryption for en-crypting at least part of said distorted content item X−y and said compensating watermark payload into an encrypted distorted content item E(X+y) and an encrypted compensating watermark payload E(w-y) on the basis of one or more encryption keys; and, combining said encrypted distorted content item with said encrypted compensating watermark payload on the basis of one or more homomorphic computations, wherein said one or more computations modify a distortion signal y in the payload of a distorted data unit into a non-perceptible watermark signal S.
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