| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of providing a rights data object. <P>SOLUTION: The method of providing rights data objects for issuing to a device having access to encrypted content belonging to one of a plurality of events and provided with an indication of a location from which the rights data object may be requested and event information uniquely associated with the event, which device includes an agent function for providing a request to a device (24) issuing rights data objects from the indicated location and data representative of the event information, and the method includes receiving the request and data representative of the event information, generating a rights data object, including event key information enabling the content data belonging to the event uniquely associated with the event information to be decrypted, and is characterized by generating the event key information using a cryptographic function that operates on at least a part of the event information. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
