DISTRIBUTION SYSTEM AND ITS METHOD, INFORMATION PROCESSING TERMINAL, ILLEGAL PROCESSING PREVENTION METHOD AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a technology of protecting a copyright by allowing information processing terminals other than the information processing terminal of a regular user which cannot normally process delivered or distributed digital data, even when the digital data having the copyright are distributed or delivered. SOLUTION: After encrypting image data distributed from a server 1 by using specific information of a computer 2 as a key, a storage device 22 stores the encrypted image data. When displaying an image, the encrypted image data are read from the storage device 22 and a cryptanalysis section 23 cryptanalyzes the encrypted image data, by using the specific information of the computer 2 for a key. Then a display device 25 displays the cryptanalyzed image data.