부산대학교 도서관

A history file that an IC card received from a receiver is confirmed to be a proper history file, so that a repeat input of a license can be prevented. A server (100) which transmits a license that has a usage condition of content includes: a classification key generating unit (101) which generates a classification key that has a history file ID for uniquely identifying each of a plurality of history files on which license-input history on the receiver side is recorded, the license-input history being distributed among the history files; a license issuing unit (103) which issues a license that has the usage condition of content in association with the classification key generated by the classification key generating unit (101); and a server communicating unit (104) which transmits the classification key and the license associated with the classification key.