New pending patent applications are published on Thursdays. Both of this week's Spotlight Applications concern aspects of digital watermarking. Assigned to LG Electronics (KR), the application discloses techniques for transmitting and receiving broadcast signals wherein a watermark is embedded in the uncompressed stream. Assigned to DivX, the second application discloses techniques for session based watermarking of media content using encrypted content streams.
20160309238, "Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals," assigned to LG Electronics (KR)
Abstract
The present invention provides a method of transmitting broadcast signals. The method includes, receiving an uncompressed broadcast content from an external receiving unit, wherein an watermark is embedded in a frame of the uncompressed broadcast content; extracting the embedded watermark from the uncompressed broadcast content; parsing the extracted watermark; generating an URL by using information in the parsed watermark; and launching an application by using the generated URL, wherein the application provides the interactive services related to the uncompressed broadcast content.20160301958, "Session based watermarking of media content using encrypted content streams," assigned to DivX, LLC
Abstract
Methods for session based watermarking of media content using encrypted content streams are provided. At least two content streams of the same media content are watermarked with different watermark information and encrypted using different encryption percentages. During a playback session, a unique sequence is generated and provided to a client device for use by the client device in selecting consecutive content segments from the different content streams to produce the original media content with a watermark that uniquely identifies a user of the client device. When selecting the different content segments, the client device compares the encryption percentage of certain selected content segments with the expected encryption percentage for those content segments to determine whether the content streams have been tampered with.
