A multimedia optical disc comprising a data area for storing at least one object that has sub-picture data and moving picture data, wherein the data area includes a plurality of small areas, each of which includes a first sub-area and a second sub-area, with the object in the data area being storeed...http://www.google.com/patents/US6285823?utm_source=gb-gplus-sharePatent US6285823 - Machine-readable data medium having interactive reproduction procedures with menu restoration after branching, a reproduction apparatus and method of restoring a menu
