On Tuesdays the USPTO publishes new patents. Both of today's Spotlight Patents address aspects of Digital Rights Management. Assigned to Oracle, the first patent concerns techniques for fencing shared resources from cluster nodes. Assigned to Sanyo (JP), the second patent concerns aspects of copy protection at least in part in the context of the now defunct HDDVD optical disc standard.
7,792,977, "Method for fencing shared resources from cluster nodes," assigned to Oracle.
Techniques are provided for managing access to resources that are shared by a cluster of nodes. One aspect of the invention is to require verification that a quorum is a valid quorum prior to enforcing the access rights specified by a node that is a member of the group of nodes holding the quorum. Further, the verification that a quorum is a valid quorum prior to enforcing access rights occurs only if the quorum associated with the specified access rights is suspected to be invalid.
7,792,002, "Optical disc device," assigned to Sanyo (JP).
When a disc loaded on a player is a hybrid next generation DVD, determination is made on whether the connected TV device is adaptable for the HD mode. Such determination is performed by whether or not the copyright protecting function of the connected TV device satisfies a condition set in advance. When adaptable for the HD mode, reproduction prioritizing the HDDVD layer is performed. When not adaptable for the HD mode, reproduction prioritizing the DVD layer is performed. Thus, the video content of HD mode recorded on the HDDVD layer is protected against leakage to the outside via the connected TV device by reproducing the DVD layer in preference in the case the copyright protecting function of the TV device is not sufficient.