K e y w o r d s H a d a m a r d matrices, Secure frameproof codes, Fingerprints. 1. I N T R O D U C T I O N With digital fingerprinting, a publisher embeds a unique fingerprint pa t te rn into each dis t r ibuted copy of a document , keeping a da tabase of sold copies and their corresponding fingerprints. If, later on, an illegally dis t r ibuted copy is… (More)
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