The PTO issues new patents on Tuesdays. Both of today's Spotlight Patents concern aspects of digital watermarking. Assigned to Nokia (FI), the first of today's patents addresses techniques for controlled copying and moving of content between devices and domains based on conditional encryption of content key depending on usage state. Assigned to Verance, the second patent addresses techniques that enable flexible insertion of forensic watermarks into a digital content signal using a common customization function.
8,549,304, "System and method for controlled copying and moving of content between devices and domains based on conditional encryption of content key depending on usage state," assigned to Nokia (FI).
A system and method is disclosed for allowing content providers to protect against widespread copying of their content, while enabling them to give their customers more freedom in the way they use the content. In accordance with one embodiment, content providers identify their content as protected by watermarking the content. Consumers use compliant devices to access protected content. All of a user's compliant devices, or all of a family's devices, can be organized into an authorized domain. This authorized domain is used by content providers to create a logical boundary in which they can allow users increased freedom to use their content.
8,549,307, "Forensic marking using a common customization function," assigned to Verance.
Methods, systems, and apparatus are disclosed which enable flexible insertion of forensic watermarks into a digital content signal using a common customization function. The common customization function flexibly employs a range of different marking techniques that are applicable to a wide range of forensic marking schemes. These customization functions are also applicable to pre-processing and post-processing operations that may be necessary for enhancing the security and transparency of the embedded marks, as well as improving the computational efficiency of the marking process. The common customization function supports a well-defined set of operations specific to the task of forensic mark customization that can be carried out with a modest and preferably bounded effort on a wide range of devices. This is accomplished through the use of a generic transformation technique for use as a "customization" step for producing versions of content forensically marked with any of a multiplicity of mark messages.