Tuesdays the USPTO publishes newly issued patents. Today's Spotlight Patents address various aspects of digital fingerprinting and watermarking. Assigned to Microsoft, the first patent addresses techniques for collusion resistant desynchronization for digital video fingerprinting. Assigned to Philips, the second patent addresses ways of using multiple watermarks to protect content material
7,397,933, "Collusion resistant desynchronization for digital video fingerprinting," assigned to Microsoft.
Abstract
Systems and methods are described that desynchronize a video to be protected, thereby creating one or more digitally fingerprinted videos. In one implementation, a video to be protected is temporally desynchronized and spatially desynchronized. A fingerprinted copy of the video, as modified by the temporal and spatial desynchronizations, is created.
7,398,395, "Using multiple watermarks to protect content material," assigned to Philips.
Abstract
Content material is protected with a variety of watermarking processes. Different subsets of the protected content material are submitted to different watermarking processes. At the rendering device, a watermark detector is configured to detect one or more different watermarks. Only if the particular watermark(s) that the rendering device is configured to detect is removed from the protected content material will the rendering device permit the rendering of the protected material. If the particular watermark(s) that the rendering device is configured to detect is unpredictable, or if the particular segment that is protected by a particular watermark is undetectable, a wholesale removal of specific watermarks from the watermarked material will neither be efficient nor economically viable.
