An optical disk includes: a data region; and a management region. The data region stores: at least one audio object containing audio information; and at least one video object containing video information and audio information, wherein the management regio...

An optical disk includes: a data region; and a management region. The data region stores first audio data obtained by expressing audio information in accordance with first audio attributes and second audio data obtained by expressing the audio information ...

An information processing apparatus first detects the residual amount of gasoline remaining in the gasoline tank, and reads out a prescribed value given as a licensed condition. Next, the apparatus reproduces a musical composition. Then the apparatus calcu...