INFORMATION STORAGE MEDIUM AND INFORMATION STORAGE PLAYBACK APPARATUS

摘要

PROBLEM TO BE SOLVED: To enable the unauthorized use (playback and utilization) to be prevented, even if all the information on a disk or the transmission information is copied wholly (disk or memory is copied). SOLUTION: This apparatus is constituted so that the modulation methods differ and the channel bit lengths simultaneously differ between a cipher related information or an information on a discrimination related information area 37 and an information on the user data areas 21, 22.