A system for processing digital audio signals. The system includes a digital audio unit configured to provide digital audio data of a first audio track and a second audio track. The first audio track and a second audio track represent different versions of the same piece of music. The system also includes a user control device operable by a user to allow the user to select either a first region or a second region. The digital audio unit is configured to play back audio signals obtained from the first audio track when the first region is selected, and to play back audio signals obtained from the second audio track when the second region is selected.

A video management system is configured to include plural terminal devices, a drive recorder to be mounted in a vehicle, and a management apparatus. The management apparatus stores the set of corresponding data generated by a generation unit, determines, upon receipt of a replay request including a piece of identification information, whether or not a piece of identification information associated with a set of video data that is a target of the replay request agrees with the piece of identification information included in the replay request, and permits a transmission source of the replay request to replay the set of video data in a case where it has been determined that these pieces of identification information agree with each other.