BOOK PROTECTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a book protection system preventing deciphered contents from being illegally peeped into during a recording process after ciphered contents are deciphered once and re-ciphered. SOLUTION: A personal computer receives a capsule 100 containing ciphered C2 contents 140 from a communication line, and the C2 contents are deciphered by a C2 contents deciphering part 1217 in a C2 contents processing part 1210 which is a tamper-resistant LSI package in a memory card writer 1200 of a PC card, and an audio data ciphering part 1223 ciphers the entire or a part of the deciphered C2 contents and outputs it to a recording part 1240. The recording par 1240 records the data ciphered in the C2 contents processing part 1210 on a memory card 1300 which is a semiconductor memory inserted into a memory card writer 1200.