On Tuesdays the USPTO publishes newly issued patents. Today's Spotlight patents address various aspects of DRM and watermarking. Assigned to Digimarc, the first patent concerns techniques for digital watermarking with variable orientation and protocols. Assigned to Intertrust, the second patent is another divisional (same specification, different claims) of the "item delivery" patent (one of mine).
7,392,394, "Digital watermarking with variable orientation and protocols," assigned to Digimarc.
The invention provides a method of forensic digital watermarking that randomly selects an orientation and/or embedding protocol for a digital watermark signal to be embedded in the content signal. It then embeds the digital watermark signal at the selected orientation in the content signal. The embedding applies a different orientation to the forensic watermark for each instance of embedding a watermark. This thwarts averaging and over-embedding attacks.
7,392,395, "Trusted and secure techniques, systems and methods for item delivery and execution," assigned to InterTrust.
Documents and other items can be delivered electronically from sender to recipient with a level of trustedness approaching or exceeding that provided by a personal document courier. A trusted electronic go-between can validate, witness and/or archive transactions while, in some cases, actively participating in or directing the transaction. Printed or imaged documents can be marked using handwritten signature images, seal images, electronic fingerprinting, watermarking, and/or steganography. Electronic commercial transactions and transmissions take place in a reliable, "trusted" virtual distribution environment that provides significant efficiency and cost savings benefits to users in addition to providing an extremely high degree of confidence and trustedness. The systems and techniques have many uses including but not limited to secure document delivery, execution of legal documents, and electronic data interchange (EDI).