A terminal device for receiving encrypted digital content provided by a digital content managing apparatus through a digital transmission system is provided. The terminal device comprise a processor which includes an ID obtaining module configured for obtaining an identification (ID) of the terminal device; and a decryption module configured for generating the password according to the ID and decrypting the encrypted digital content received by the receiving unit. The ID is provided to the digital content apparatus to generate a password to encrypt digital content subscribed by the terminal device. A digital content managing apparatus accessible for the terminal device is also provided.