Patent ID: 7742683

Claim:
An information record medium that is a computer-readable medium onto which a whole stream including a plurality of partial streams each composed of video information or audio information is multi-recorded by a packet unit that is a physically accessible unit, the video information or the audio information providing a series of content executable by a computer to control the computer to act as an information reproduction apparatus, said information record medium including: an object data file for storing object data composed of a plurality of packets each storing pieces of the video information or the audio information and being a logically accessible unit; and an object information file for storing, as reproduction control information to control a reproduction of the object data file, (i) relationship definition information to define a relationship between a plurality of packets to be multiplexed on a time axis and the plurality of partial streams, and (ii) reproduction output group definition information to define a group of partial streams switchable to each other by the information reproduction apparatus from among the plurality of partial streams, the group being reproduced and outputted collectively, as a reproduction output group, wherein the plurality of partial streams includes a plural-channels stream that is composed by recording the audio information for a plurality of channels overlappingly in one partial stream, and the reproduction output group definition information includes channel designation information to designate at least one channel from among the plurality of channels, and an information on an access position to the partial stream corresponding to the channel designation information.