Patent ID: 7869595

Claim:
A content copying device that copies an encrypted content from a first recording medium to a plurality of second recording media, the first recording medium having a first authentication key, an encrypted content key which is a content key subject to encryption, and an encrypted content which is a content encrypted with the content key which is not encrypted, each of the plurality of second recording media having a second authentication key, the content copying device comprising: a first generator operable to perform a mutual authentication with the first recording medium to generate a first medium unique key corresponding to the first authentication key; an obtainer operable to obtain the encrypted content key and the encrypted content from the first recording medium; and a first re-encryptor operable to decrypt the encrypted content key which is obtained from the first recording medium with the first medium unique key, and re-encrypt the decrypted content key with a key which is different from the first medium unique key, wherein the content copying device is configured to copy the content to the plurality of second recording media based on the encrypted content obtained from the first recording medium and the re-encrypted content key.