Abstract: According to one embodiment, a copyright-protected chip includes a selector which connects a host controller to a circuit in the copyright-protected chip, a second register in which a encrypted content key, decryption key generation information, and shared classified information stored in a storage device are stored, and a communication circuit which communicates with the host controller and transmits the encrypted content key and the decryption key generation information stored in the register to the host controller when an access module accesses content obtained by decrypting the encrypted content stored in a hard disk.

Abstract: This invention provides a communication network system capable of obtaining setting information used in a network application program. This invention acquires setting information by using a protocol in which the option field of DHCP (Dynamic Host Configuration Protocol) contains a first field of 2 bytes or more which stores an identification number representing the type of setting information, and a second field which stores the setting information.