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 device,...http://www.google.co.uk/patents/US6393206?utm_source=gb-gplus-sharePatent US6393206 - Optical disc recording apparatus and recording method for facilitating dubbing
