Renner, Otto, Boisselle & Sklar LLP
Optical disk, reproduction apparatus, and reproduction method
 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 in accordance with second audio attributes which are different from the first audio attributes, and the management region stores management information for enabling selective reproduction of one of the first audio data and the second audio data. 
Matsushita Electric Industrial Co., Ltd.
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Kazuhiko Masayuki Yoshihiro
Yamauchi Kozuka Mori