Thursdays the Patent Office publishes new pending patent applications. Both of today's Spotlight Applications concern aspects of digital watermarking. Assigned to Intertrust, the first application discloses techniques for software self-checking. Assigned to Verance, the second application discloses techniques for the extraction of embedded watermarks from a host content based on extrapolation techniques.
20130111215, "Software self-checking systems and methods," assigned to Intertrust Technologies.
Software self-checking mechanisms are described for improving software tamper resistance and/or reliability. Redundant tests are performed to detect modifications to a program while it is running. Modifications are recorded or reported. Embodiments of the software self-checking mechanisms can be implemented such that they are relatively stealthy and robust, and so that it they are compatible with copy-specific static watermarking and other tamper-resistance techniques.
20130117571, "Extraction of embedded watermarks from a host content based on extrapolation techniques," assigned to Verance Corporation.
Methods, devices and computer program products facilitate the extraction of embedded watermarks in the presence of content distortions. Subsequent to the detection of a tentative watermark, particular sections of the content are examined to form one or more extrapolated watermarks or watermark segments. Weights are assigned to the extrapolated watermarks or watermark segments, and used in combination with the detected tentative watermark to collectively assess if a desired probability of false detection is satisfied.