New patents are issued by the USPTO on Tuesdays. Today's Spotlight Patents concern aspects of digital watermarking. Assigned to Google, the first patent addresses techniques for secure session-based video watermarking for online media streaming. Assigned to Toshiba, the second patent addresses techniques for a generating unit that makes use of a key random number which is input, and outputs a filter for determining a first band and a second band which represent at least a single pair of frequency bands in which a digital watermark bit is to be embedded.
10,432,991, "Secure session-based video watermarking for online media streaming," assigned to Google
Abstract
A method includes generating a first media file that includes a plurality of first media file segments, generating a second media file as a copy of the first media file, the second media file includes a plurality of second media file segments, embedding a first watermark with the plurality of first media file segments, embedding at least one second watermark with the plurality of second media file segments, generating a manifest file based on a portion of the plurality of first media file segments and a portion of the plurality of second media file segments, the manifest file including a plurality of addresses each referencing a media file segment, and encrypting each of plurality of addresses.
10,424,310, "Digital watermark embedding device, digital watermark detecting device, digital watermark embedding method, digital watermark detecting method, computer-readable recording medium containing digital watermark embedding program, and computer-readable recording medium containing digital watermark detecting program" assigned to Kabushiki Kaisha Toshiba (JP).
Abstract
A digital watermark embedding device includes a generating unit that makes use of a key random number which is input, and outputs a filter for determining a first band and a second band which represent at least a single pair of frequency bands in which a digital watermark bit is to be embedded; and an embedding unit that, when the digital watermark bit is to be embedded in a unit frame of a voice signal which is input, varies a sum of amplitude spectrum intensities of at least one of the first band and the second band in such a way that a first sum of amplitude spectrum intensities of the first band is greater than a second sum of amplitude spectrum intensities of the second band.
