Described herein are systems, methods, etc. Information representative of states of an IN point and an OUT point on a Clip, designated by a Playitem, of a Playlist in which at least more than one Playitems are arranged in the order of reproduction is described in a block Playitem. The connecting rod mechanism is rotatably mounted between the base and the cover and is configured to rotate the cover relative to the base. Systems, engines, methods, and schemata for synchronizing a pirated copy with original multimedia content to facilitate fingerprint recovery are also described.