Content distribution server, key assignment method, content output apparatus, and key issuing center

摘要

The present invention is a content distribution system for distributing contents. The content distribution system ( 1 ) includes a key issuing center ( 11 ), a server ( 12 ), eight output apparatuses ( 13 a) to ( 13 h), and a communication path ( 10 ) that connects them to each other. Here, a pair of the key issuing center ( 11 ) and each of the output apparatuses ( 13 a) to ( 13 h) is previously given an individual key shared between them. For example, the key issuing center ( 11 ) shares an individual key IKa with the output apparatus ( 13 a), an individual key IKb with the output apparatus ( 13 b), and an individual key IKh with the output apparatus ( 13 h).