Secure Distribution of Watermarked Content
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United States of America Patent
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Issued Date -
Dec 15, 2016
app pub date -
Oct 23, 2013
filing date -
Oct 30, 2012
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Abstract
Methods and systems are described for enabling secure delivery and watermarking of at least part of a content item X using a split-key cryptosystem comprising encryption and decryption algorithms E and D, a key generating algorithm for generating encryption and decryption keys e, d, a split-key algorithm for splitting e into i different split-encryption keys e1, e2, . . . , ei and/or for splitting d into k different split-decryption keys d1, d2, . . . , dk respectively wherein i, k≧1 and i+k>2; wherein executing i consecutive encryption operations and k consecutive decryption operations on content item X using said split-encryption and split-decryption keys respectively, generates a fully decrypted content item X (Ddk(Ddk-1( . . . (Dd2(Dd1(Eei(Eei-1( . . . (Ee2(Ee1(X)) . . . ))=X).
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