| 摘要 |
A content distribution method is provided that restricts content distribution means to a specific distribution method and traces a content distribution route in the specific distribution method, without any leakage, even when a user who does not reproduce contents on the way exists. The content distribution system primarily encrypts contents to distribute them from the server. When contents are distributed between terminals, a transmission terminal registers an encryption key for communication encryption in a server. A reception terminal captures the encryption key from the server. Thus, the server saves the content distribution route. Moreover, each terminal accesses the server to reproduce the contents. When the server verifies that the contents have been distributed to the terminal, the server issues the content reproduction key.
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