Distribution of digital content protected by watermark-generating password
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United States of America Patent
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Aug 16, 2016
Grant Date -
Nov 28, 2013
app pub date -
Dec 16, 2011
filing date -
Jan 3, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A receiver receives digital content scrambled using a control word and a user code for the scrambled content. A user inputs the user code that is forwarded to a code extractor that generates the control word and a user identifier from it. The control word is sent to a descrambler, a watermark information generator and a visible watermark insertion unit. The descrambler descrambles the scrambled content using the control word, an invisible watermark insertion unit inserts invisible watermark information obtained from the watermark information generator into the descrambled content and the visible watermark insertion unit inserts the user identifier as a visible watermark. Also provided are a corresponding method for processing digital content and a method and a device for generating the user code.
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