| 摘要 |
According to one embodiment, a transmitter configured to transmit content to a receiver. Available dubbing count is set in advance for the content such that the content can be dubbed a plurality of times. The transmitter includes a key exchanger, an encryption processor, and a management module. The key exchanger performs key exchange to share a common key with the receiver, and transmits the common key and at least one count label corresponding to the number of times of dubbing to the receiver. The encryption processor encrypts, in response to a content request for the content received from the receiver, the content with the common key to transmit the content to the receiver. The management module reduces the available dubbing count of the content upon each receipt of a right transfer request requesting to transfer right to use the content from the receiver, and transmits permission to the receiver to validate the right to use the content.
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