Security chip used in a contents data playing device, update management method, and update management program

Abstract

A security chip is used in a contents data playing device. The security chip includes a storage unit configured to store firmware data including a firmware program, and a firmware update management unit configured to determine whether an update process is to be executed on the firmware data based on a comparison between expiration information set for the firmware data and time information received via a network, in response to a request input to the security chip to acquire a contents key or to decrypt contents data, and to reject the request when the update process is to be executed. The firmware program causes the security chip to function as a contents key acquisition control unit configured to acquire, via the network, the contents key for decrypting the contents data, and a decryption unit configured to decrypt the contents data by using the contents key.