| 摘要 |
<p>A data provider (1) for use in a digital rights management system comprises a data protector (2) for protecting data (20), using attribute-based encryption, in dependence on an access policy over a plurality of attributes. A license issuer (3) issues a license (17) comprising a representation of a set of usage rights (18), wherein the set of usage rights (18) is associated (19) with the data (20), for granting the usage rights (18) in respect of the data (20) to a plurality of entities (10) having attributes satisfying the access policy. A data receiver (10) comprises a data access subsystem (11) for accessing data, using attribute-based decryption, in dependence on a decryption key (16) associated with a set of attributes. The data receiver (10) further comprises a usage constraining subsystem (12) for constraining the access to the data (20), based on a license (17) comprising a representation of a set of usage rights (18) associated (19) with the data.</p> |
