An apparatus transfers the title of content to an ID-assigning unit which assigns an ID to the content and transmits the content ID to a broadcasting unit via a tagging unit. A broadcasting apparatus then broadcasts the content ID and a receiver extracts the content ID from a received signal and transfers...http://www.google.de/patents/US7984167?utm_source=gb-gplus-sharePatent US7984167 - Apparatus, system and method for secure information dissemination
