A content encryption device generates encrypted content and an encrypted content copying device copies the encrypted content on an information storage medium. The storage medium is sold at a charge or distributed at no charge. A user gets the storage medium to connect or set it to or in a user terminal device, accesses to a user management device to receive permission by authentication information distributed together with the storage medium and presents a part or a whole of medium information to a content key distribution device. The distribution device makes a content key encryption device issue an encrypted content key on the basis of the presented information and distributes it to the terminal device.