Patent ID: 7873264

Claim:
A non-transitory recording medium on which play list information and an audio stream are recorded, wherein the play list information contains main-path information and sub-path information, the main-path information specifies one among a plurality of digital streams as a main stream and defines a main reproduction section for the main stream, the sub-path information specifies another one among the plurality of digital streams as a sub stream and defines, for the sub stream, a sub reproduction section that is to be synchronized with the main reproduction section, the main stream includes a video stream and a primary audio stream multiplexed therein, the audio stream is specified as the sub stream and includes a plurality of packets which are each attached with a packet identifier that includes an upper field and a lower field, and the upper field indicates that the audio stream is a secondary audio stream whose reproduction output is able to be mixed with a reproduction output of the primary audio stream.