METHOD AND APPARATUS FOR INFORMATION RECORDING, APPARATUS FOR REPRODUCING AND METHOD FOR INFORMATION PROTECTION

摘要

Information DI recorded on a disk and which is distinctively characteristic to the individual disk is used to encode contents. When the contents are to be played back, the encoded contents are decoded by the characteristic information DI that is recorded on the disk D. By recording onto the disk D the characteristic disk information DI and identifying information that is distinctive to the particular contents, and then searching from the identifying information for the encoded key using a CI comparison section (210), it is possible to decode and play back the contents of the disk.