| 摘要 |
PROBLEM TO BE SOLVED: To allocate a medium inherent number to a medium, to provide license to execute software to the inherent number and to make it possible to execute only the software licensed and stored in a normal medium. SOLUTION: Ciphered electronic data 14 and a medium inherent number 12 inherent in a medium 1 are stored in the medium 1. A licenser side generates a medium inherent key on the basis of the inherent number 12 of the medium 1 and ciphers an electronic data deciphering key as license information 13 by using the medium inherent key and a user side generates a medium inherent key based on the medium inherent number 12 read out from the medium 1, deciphers the license information 13 by using the medium inherent key and deciphers the read ciphered electronic data 14 by the electronic data deciphering key to obtain normal electronic data. |
