A recordable optical disc stores one or more video objects. A video stream, a first audio stream, and a second audio stream which is used for dubbing are multiplexed into each video object. Also, an optical disc recording apparatus generates the second audio stream by an audio stream generating means,...http://www.google.com.hk/patents/US20040071446?utm_source=gb-gplus-share專利 US20040071446 - Optical disc, optical disc recording apparatus, and optical recording method for facilitating dubbing, storage medium for storing optical disc recording a program for facilitating dubbing, optical disc reproducing apparatus, and optical disc reproducing method
