To provide a printing system of delivered printing data capable of performing accounting according to the number of prints.

This printing system comprises a security device having an information storage area not operable from the outside, and a terminal device connectable to a printer and a server communicable through a network, and attachable to and detachable from the security device, which allows the printer to print the printing data only when the installed security device is recognized. The program and medium are used for this system.