Patent ID: 7991832

Claim:
An information processing apparatus that obtains pieces of content information relating to content recorded in an information recording medium, the information processing apparatus comprising: a content identifier generation unit configured to read a content certificate corresponding to the content stored in the information recording medium, the content certificate being recorded in the information recording medium and including content hash table digests generated as digest values based on hash values recorded in a content hash table, the hash values being generated based on hash units included as configuration data in the content, and to generate a content identifier by combining the content hash table digests in an order based on a location of the hash units in the information recording medium; a data transmitting unit configured to transmit the content identifier to a content information provision server; a data receiving unit configured to receive, from the content information provision server, pieces of content information relating to the content, the pieces of content information being based on the transmitted content identifier; and a data outputting unit configured to output the pieces of content information.