Data distribution system

摘要

A memory card 110 performs decryption processing to extract a session key Ks from data applied from a server to a data bus BS3 over a cellular phone network. An encryption processing unit 1406 encrypts public encryption key KPcard(1) of memory card 110 based on session key Ks, and applies the same to the server via data bus BS3. A register 1500 receives and stores data such as decrypted license ID and user ID from the server, and a memory 1412 receives and stores encrypted content data ÄDcÜKc applied from data bus BS3 and encrypted with a license key Kc.