Abstract: The owner (B) of a copy (A) of a specific paper book inputs his/her copy (A) into a machine (C) of a system. (C), for example, a vending machine, acquires the paper book and then requests user authentication to (B). (B) identifies the identification card and his/her fingerprint to the machine. The machine transmits the acquired information to the system server, and the system server recognizes that (B) is the specific system user (B?) registered in the system and (B?) owns (A). Thereafter, the system server allows (B?) access to the digital content associated with (A). Then, the system server creates an “authenticator behavior rule (D)” unique to (A) and presents the same to (C). (C) leaves a physical mark somewhere in (A) and returns the same to (B) according to (D) received. (B) accesses the system server through his/her own client device, requests a system service from the system server after a user/device authentication process, and receives the service (a usage right, an access right, etc.