Information recording device, information playback device, information recording method, information playback method, and information recording medium and program providing medium used therewith

摘要: An information recording/playback device stores beforehand, on a recording medium, secret in which writing/reading method thereof cannot be analyzed and can read only by special reading method. The is applied to key for content encryption or decryption when performing playback of contents the such as music data image data. is, example, stamper ID. By using ID information, master media are distributed tree-structure key-distribution system, content-cryptosystem generated. Accordingly, each allowed used an appropriate executed system.