The sheet metal blank to be press molded comprises a product section and a grip section disposed on the periphery of the product section. The systems and methods provide an encrypted copy of a digital content unit to a first user and transcript the encrypted copy to generate the legitimate copy to a second user. The rear fastening part includes a second through-penetrating passageway and an elastic pressing element monolithically connected to the rear fastening part and abutting against the elastic engaging member.