Techniques for processing media data. Techniques are provided for using media keys that have been created for media data. A media key may be used to access media data for which the media key has been created. A media key has information associated with it that may be used to access the media data corresponding...http://www.google.es/patents/US20070233613?utm_source=gb-gplus-sharePatente US20070233613 - Techniques for using media keys
