Method of authorizing access to content

A method of and source device ( 410 ) for authorizing access to content ( 425 ) by a sink device ( 400 ) in accordance with usage rights, the content being stored on a storage medium ( 420 ) controlled by the source device. The revocation status of the sink device is verified using the most recently issued revocation information that is available if the usage rights need to be modified as part of the authorization of access to the content, and using revocation information associated with the content stored on the storage medium, preferably the revocation information stored on the storage medium, otherwise. The revocation information on the storage medium, or only the part relating to the sink device, is optionally updated to the most recently issued revocation information if the usage rights need to be modified. Preferably this is done only if the result of the verification is that the sink device has been revoked.