METHOD AND DEVICE FOR SELLING DIGITAL INFORMATION

摘要

PROBLEM TO BE SOLVED: To provide a method which prevents digital information of digitized video, music, books, etc., from being illegally copied and enables the person who has the right of the digital information to collect the charge for the use of the copied digital information. SOLUTION: Key information 156 which allows the digital information 158 to be used is copied while looked and when the key information 156 is unlocked, the selling source 150 is accessed and paid for the use of the digital information.