Today's Spotlight issued patents concern various aspects of digital rights management. Assigned to Adobe, the first patent concerns nestable skeleton decryption keys for digital rights management. Assigned to LG Electronics, the second patent concerns techniques for providing digital electronic books.
7,359,517, "Nestable skeleton decryption keys for digital rights management," assigned to Adobe.
A document access control scheme uses digital "skeleton keys" to distribute access permissions for encrypted documents in a manner that does not require that rights management files (RMFs) be associated with each document. Multiple skeleton keys can be issued for the same document. The skeleton keys themselves can be opened by one or more other skeleton keys for different levels of document access.
7,359,944, "Method of providing digital electronic book," assigned to LG Electronics (KR).
Disclosed is a contents-providing service through a communication network and a system thereof and, more particularly, a method of providing a digital electronic book suitable for securing a copyright profit, by transferring a digital electronic book or digital multimedia with an advertisement. The method provides portions of a digital e-book in proportion to the degree that a user views an advertisement. Moreover, the method evaluates the e-book based on a user's acknowledgment responses to the advertisement.