The recording medium includes a data structure with at least one playlist file stored in a playlist area of the recording medium. The playlist file includes at least one playitem, at least one sub-playitem and mark information. The playitem provides navigation information for reproducing at least one...http://www.google.com/patents/US7801421?utm_source=gb-gplus-sharePatent US7801421 - Recording medium having data structure for managing reproduction of still pictures recorded thereon and recording and reproducing methods and apparatuses
