CONTENT DISTRIBUTION SYSTEM, TERMINAL, AND SERVER

摘要

A content distribution system includes a first recording medium (1) containing a content encrypted by a content encryption key, a portable second recording medium (2), a terminal (10) to which the first recording medium and the second recording medium can be detachably attached, a communication device (20) to which the second recording medium can be detachably attached, and a server (40) connected to a communication device. The terminal writes the first encrypted data obtained by encrypting a communication key and an owner ID by a public key, onto the second recording medium and mounts it on the communication device to be sent to a server. The server decrypts the received first encrypted data by a secret key to obtain a communication key. The server sends second encrypted data obtained by encrypting the content decryption key by the communication key, to the communication device and records it onto the second recording medium. The terminal decrypts the content stored in the first recording medium by using the content decryption key obtained by decrypting the second decrypted data read from the second recording medium, by using the communication key.