from the encrypted audio data using the present invention application_number US 81901401 A description reference will now be made in detail to the present embodiments of the present invention examples of which are illustrated in the accompanying drawings wherein like reference numerals refer to like elements throughout 0040 fig2 illustrates a data structure on a recording medium which is compatible with the existing dvd video and dvd audio specifications and on which audio data encrypted according to the present invention is recorded an example of a disc used in the present invention is a dvd rom having a 4 7 gbyte capacity for recording video and audio information complying with the dvd video specification and audio information complying with the dvd audio specification on the region for dvd video of a disc according to the present invention encrypted video data 31 and audio data which is not encrypted 32 hereinafter referred to as a first audio data are multiplexed and recorded complying with the dvd video specification also reproducing information not shown for reproducing these data 31 and 32 is recorded as management information in the dvd video region meanwhile the video data 31 the first audio data 32 and encrypted audio data 33 hereinafter referred to as a second audio data are multiplexed and recorded however management information on the second audio data 33 is recorded so that the existing dvd video reproducing apparatus cannot reproduce the management data that is the reproducing management information of the video data 31 and the first audio data 32 the management information for reproducing only the first audio data 32 the reproducing management information of the video data 31 and the second audio data 33 the management information for reproducing only the second audio data 33 are recorded in the.