The present invention provides an access control method of controlling acceptance or rejection of access to content from metadata. The access control method according to the present invention includes a step of producing metadata 3A for content 6A and embedding a digital signature 4A of a producer who...http://www.google.com/patents/US7937407?utm_source=gb-gplus-sharePatent US7937407 - Access control method, access control system, metadata controlling device, and transmitting apparatus
