A data processing device for playing back a digital work reduces the processing load involved in verification by using only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on a DVD. A Portable Document Format server identifies segments of a spool file by identifying Base Name Group commands in the data stream generated by an application. The PECVD is conducted at a temperature of greater than 300\xb0 C. The plate 57 is unrotatable and axially movable with respect to the front cover 2, and is arranged on the turbine side of the plate 52. When the player rotates the sub-frame by one-hundred eighty degrees during game play, the plurality of slide rows containing a sub-set of the plurality of tiles are oriented such that the rear facing portions of the sub-set of the plurality of tiles are viewable from the front facing portion of the frame, and the plurality of slide rows are inverted as viewed along the vertical axis. Plasmonic image pixels may be smaller and more efficient than conventional image pixels.