An example system causes a computer of an information processing device including a restriction unit for restricting use of functions and a handwritten input receiving unit to carry out functions of requesting an input of a handwritten signature, sending, to a server, a result of a handwritten input which has been input in response to the request of the signature input, and receiving the input of authorization information which has been issued by the server that has received the handwritten input result and which shows that the use of the functions is authorized, and moreover cancelling the restriction by the restriction unit when the input of the authorization information is received.