Communication system and control method thereof
AssigneeCanon Kabushiki Kaisha
InventorSatoshi Nakama
Life of this patent
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Abstract
A method for controlling a communication system comprising obtaining moving picture data, inquiring about processing capability with respect to the obtained moving picture data, changing a preset transfer rate of the moving picture data to a changed transfer rate based on the inquiry results, and transmitting the moving picture data using the preset transfer rate or the changed transfer rate.
Claims20
A transmission device for transmitting an encrypted moving image data to a reception device, the transmission device comprising:
- an encryption unit configured to generate the encrypted moving image data;
- a control unit configured (a) to request that the reception device transmits a processing capability of a decryption unit to the transmission device, wherein the decryption unit is configured to decrypt the encrypted moving image data and is included in the reception device, and (b) to change a transfer rate of the encrypted moving image data to one of a first transfer rate and a second transfer rate based on the processing capability transmitted from the reception device to the transmission device, wherein the second transfer rate is lower than the first transfer rate;
- and
- a transmission unit configured (a) to transmit the encrypted moving image data to the reception device using the first transfer rate if the transfer rate of the encrypted moving image data is changed to the first transfer rate, and (b) to transmit the encrypted moving image data to the reception device using the second transfer rate if the transfer rate of the encrypted moving image data is changed to the second transfer rate.
A method for controlling a transmission device that transmits an encrypted moving image data to a reception device, the method comprising the steps of:
- generating the encrypted moving image data;
- requesting that the reception device transmits a processing capability of a decryption unit to the transmission device, wherein the decryption unit is configured to decrypt the encrypted moving image data and is included in the reception device;
- changing a transfer rate of the encrypted moving image data to one of a first transfer rate and a second transfer rate based on the processing capability transmitted from the reception device to the transmission device, wherein the second transfer rate is lower than the first transfer rate;
- transmitting the encrypted moving image data to the reception device using the first transfer rate if the transfer rate of the encrypted moving image data is changed to the first transfer rate;
- and
- transmitting the encrypted moving image data to the reception device using the second transfer rate if the transfer rate of the encrypted moving image data is changed to the second transfer rate,
- wherein the method is performed by a processor.
Dependencies are inferred from the claim text.