Upon playback of stream data which is recorded while being appended with time stamp information in units of packets, time management is made using the time stamp information. A video playback time viewed from the user, which may be indicated by I-, B-, and P-picture display times, is different from the...http://www.google.co.uk/patents/US7218838?utm_source=gb-gplus-sharePatent US7218838 - Recording medium of stream data, and recording method and playback method of the same