DATA TERMINAL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a data terminal device capable of ripping contents data off in response to regularity in the usage rules of contents data. SOLUTION: A watermark detection means 5400 detects a watermark from music data, and a watermark decision means 5401 decides whether the usage rule of the detected watermark has any regularity. A license generation means 5403 generates a license according to the regularity in the usage rules for the watermark. A remark means 5402 replaces the watermark with the one of which the copying condition for musical data is changed according to the regularity in the usage rules for the watermark. A music encoder 5404 encodes music data from the remark means 5402 to a prescribed method. A cipher means 5405 encrypts music data from the music encoder 5404 by the license key generated at the license generation means 5403.