License issuing device/method and contents reproducing device/method

摘要

A license issuing device encrypts license information of contents desired by a user with device ID of a memory card carried by the user, and writes the encrypted license information in the memory card. A contents reproducing device decrypts the license information written in the memory card carried by the user with the device ID of the memory card. The contents reproducing device decrypts encrypted contents corresponding to the contents of which use is permitted in the decrypted license information and reproduces the decrypted contents.