The PTO issues new patents on Tuesdays. Both of today's Spotlight Patents concern aspects of digital watermarking. Assigned to MobiTV, the first patent addresses techniques for watermarking of digital video. Assigned to Cisco, the second patent addresses techniques for robust watermarking.
8,818,021, "Watermarking of digital video," assigned to MobiTV.
Techniques and mechanisms for watermarking of digital video are described herein. According to various embodiments, a request to transmit to a client machine video content based on a video content distribution item may be received. The video content distribution item may be divided into a plurality of video content segments. Designated ones of the video content segments may have a respective plurality of alternate video content segment encodings. Each of the alternate video content segment encodings may include a respective digital watermark. Different digital watermarks may encode different information within the alternate video content segment encodings. One of the respective alternate video content segment encodings may be selected for each of the designated video content segments to create a digital watermarking message to include in the video content. The video content including the selected video content segment encodings may be transmitted to the client machine.
8,818,019, "Robust watermark," assigned to Cisco.
A method and system for embedding a watermark in block encrypted content, including encoding a bit string, the bit string including n bits, denoted b.sub.0-b.sub.n-1, the encoding including translating each bit, b.sub.0-b.sub.n-1, into a block of data, according to the following rule if b.sub.i=1, then translate b.sub.i into a block of data of a first type, and if b.sub.i=0, then translate b.sub.i into a block of data of a second type, thereby translating the n bits into n blocks of data corresponding to each bit b.sub.0-b.sub.n-1, arranging a composite block of data including the n blocks of data, and at least one additional block indicating the presence of the n blocks of data, and inserting the composite block of data into a content item as a watermark, wherein the watermarked content item is encrypted using an ECB mode of encryption. Related methods and apparatus are also described.