Patent ID: 7305086

Claim:
A system for detection of a watermark in digital content, comprising: a recording device having a first watermark detection component of a first sensitivity for detecting the watermark in digital content; and a playback device having a second watermark detection component of a second sensitivity for detecting the watermark in a digital content recording made by the recording device; wherein the first sensitivity is more sensitive than the second sensitivity, in that the recording device checks the digital content for the watermark more often than the playback device checks the digital content for the watermark, or the recording device checks the digital content for the watermark with a computational precision less than a computational precision used by the playback device to check the digital content for the watermark: the recording device to make an unencrypted recording of the digital content for playback by the playback device when the watermark is not detected in the digital content and to make an encrypted recording of the digital content for playback by the playback device when the watermark is detected in the digital content; and the playback device to play the unencrypted recording when the watermark is not detected and to not play the unencrypted recording when the watermark is detected.