| 摘要 |
<p>Disclosed is a broadcast reception terminal that implements playback control in accordance with actual playback time without being affected by the update frequency of a decryption key for broadcasted playback data. The disclosed broadcast reception terminal (1) is provided with a CAS module (105), which obtains key information from a broadcast signal, and a renderer (102), which plays back audio/video data included in the broadcast signal. The CAS module (105) has a history information storage unit (113), which stores playback history information, and a playback time calculation unit (111), which computes remaining playback time information for the audio/video data and passes a scrambling key and the remaining playback time information to the renderer (102). The renderer (102) has a descrambling unit (107) and a decoding unit (108), which decrypt/playback the audio/video using the scrambling key and pass history information regarding said playback to the CAS module (105), and a preview control unit (109), which makes it so that only an amount of the audio/video data corresponding to the time indicated by the remaining playback time information is decrypted.</p> |
