Abstract: A digital camera comprising: an imaging unit operable to generate an image by photographing an object; a receiving unit operable to receive information relating to image processing from one or more transmission devices; a judging unit operable to judge whether the image is to be output or not, based on the information received by the receiving unit; and an output unit operable to, in accordance with the judgment made by the judging unit, output the image to a memory, or discard the image, where the memory is readable by the digital camera or an external device.

Abstract: A key issuing center (11) distributes a system secret parameter group that is information necessary for generating a content key used for encrypting a content to a server (12), and an encrypted intermediate key group set that is information necessary for generating a content key used for decrypting the content to output apparatuses (13a to 13n). The server (12) generates the content key based on the system secret parameter group and a time varying parameter group, encrypts the content based on the content key, and distributes the encrypted content and the time varying parameter group to the output apparatuses (13a to 13n). The output apparatuses (13a to 13n) generates a content key based on the encrypted intermediate key group set and the received time varying parameter group, decrypts the encrypted content based on the content key, and outputs to outside.