ENCRYPTION PROTECT OPERATION SYSTEM AND OPERATION CONTROL METHOD THEREOF, AND PORTABLE RECORDING MEDIA RECORDING PROGRAM FOR MAKING COMPUTER DEVICE FUNCTION AS ENCRYPTION PROTECT OPERATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To achieve content protection (prevention of information leakage), while aiming for speed up of content playback.SOLUTION: By loading an encryption protect CD-ROM 10 to an optical disk driver 5, a Web server part 11, a decryption engine 14, a client part (a dedicated viewer) 12 and a disk check part 13 are built temporarily in a volatile memory 8. A file requested from the client part 12 has been encrypted and recorded in the CD-ROM 10. The encryption file of the CD-ROM 10 is decrypted by the decryption engine 14 in units of block, without waiting decryption of the whole encryption file. Plaintext blocks generated by decryption are outputted sequentially to the client part 12 by the Web server part 11, and streaming played in a display device 3.SELECTED DRAWING: Figure 1