Printer, printing system and printing method for preventing abnormal printing

摘要

A printer prints a print job having a plurality of blocks each of which has a block size section and corresponding data that should be printed. A receiving section receives the print job from an external apparatus. A comparing section compares a content of the block size section with a threshold value. When the content of the block size section exceeds the threshold value, a discarding section discards a subsequent portion of the data. The threshold value is set to a user's desired value.