Patent ID: 8020214

Claim:
A transmitter configured to transmit content to a receiver, available dubbing count being set in advance for the content such that the content can be dubbed a plurality of times, the transmitter comprising: a key exchanger configured to perform key exchange to share a common key with the receiver; an encryption processor configured to encrypt, in response to a content request received from the receiver, the content with the common key to transmit the content to the receiver; and a dubbing management module configured to reduce, upon receipt of a right transfer request related to use of the content from the receiver, the available dubbing count by a dubbing count indicating the number of times of dubbing the content, the dubbing count being contained in the right transfer request, wherein the key exchanger is configured to transmit the common key to the receiver together with the dubbing count of the content, and the dubbing management module is configured to receive the dubbing count of the content transmitted by the key exchanger from the receiver as the dubbing count contained in the right transfer request.