Acquisition of signed rights label of digital content using the right template with flexibility in copyright management system (SRL)

摘要

Content is encrypted according to a content key (CK) to result in (CK(content)) and the content key (CK) is protected according to a public key for a license server (PU-RM). Rights data is retrieved from a rights template to be associated with the content, and rules for modifying the retrieved rights data are also retrieved from the retrieved rights template. The retrieved rights data from the rights template is modified according to the rules, and the rights data and the protected content key (CK)) are submitted as a rights label to the license server for signing thereby. The license server thus validates the rights label and, if valid, creates a digital signature based on a private key (PR-RM) corresponding to (PU-RM) and based at least in part on the rights data to result in a signed rights label (SRL), and returns the SRL.