| 摘要 |
An audio-video output apparatus of the present invention outputs at least one of audio data and video data to a receiving apparatus using High-Definition Multimedia Interface (HDMI) communications. The audio-video output apparatus includes a list holding unit, an authenticating unit, a list acquiring unit, an updating unit, and an apparatus verifying unit. The list holding unit holds an unauthorized apparatus list which shows information about unauthorized apparatuses. The authenticating unit performs first apparatus authentication to verify whether or not the receiving apparatus is an authorized apparatus using the unauthorized apparatus list held by the list holding unit, and performs second apparatus authentication at regular intervals to verify the receiving apparatus is an authorized apparatus. The list acquiring unit acquires another unauthorized apparatus list. When the unauthorized apparatus list acquired by the list acquiring unit is newer than the unauthorized apparatus list held by the list holding unit, the updating unit updates the unauthorized apparatus list held by the list holding unit to the unauthorized apparatus list acquired by the list acquiring unit. When the unauthorized apparatus list is updated by the updating unit, the apparatus verifying unit verifies whether or not the receiving apparatus is an authorized apparatus using the updated unauthorized apparatus list, the verification being performed in parallel with the second apparatus authentication performed by the authenticating unit.
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