DISK-SHAPED RECORDING MEDIUM, RECORDING METHOD FOR DISK-SHAPED RECORDING MEDIUM AND REGENERATING METHOD FOR DISK-SHAPED RECORDING MEDIUM

摘要

PURPOSE: To prevent illicit reproduction by attaining approximately perfect file locking. ;CONSTITUTION: At the time of recording, a vender unique region access controller 6 records the vender key intrinsic to a medium and intrinsic to a file in the vender unique region 3a of the medium 3 and an encoder 8 calculates a file block key in accordance with the a prescribed encoding algorithm from the block number of the vender key and the file and records the data of the respective blocks of the file together with this file block key. At the time of reproducing, a decoder 12 calculates the vender key in accordance with the encoding algorithm from the file block key and block number read out of the file 3 and compares the vender key and the vender key reproduced by the vender unique region access controller 6. The data is outputted only when both coincide.;COPYRIGHT: (C)1996,JPO