Conditional access using embedded watermarks

R Petrovic, J Zhao, JM Winograd - US Patent 9,323,902, 2016 - Google Patents
Methods, devices and computer program products facilitate conditional access to a content
embedded with watermarks. For Such a content, when copy control rules associated with an
embedded watermark message prohibits unconditional access to the content, it is
determined whether or not an exception to the copy control rules exists, and if an exception
to the copy control rules exists, the content is conditionally accessed. Additional watermark
messages can be extracted while the content is being conditionally accessed, and based on …
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