RECORDING DEVICE, CONTENT KEY PROCESSING DEVICE, RECORDING MEDIUM, AND RECORDING METHOD

摘要

A recording device has a content encryption section for writing contents that have been encrypted by a content key and has a key encryption section for encrypting the content key and writing the result in the recording medium. A content key processing device has key decryption section for decrypting a content key that has been encrypted and recorded in a recording medium and a key encryption section for re-encrypting the decrypted content key by using predetermined information and writing the result in the recording medium.