US Patent 8649044 Computer processing of differences between print job files

Processing print jobs on a computer which comprises generating a first print ready job file by a first print module based on an input print job file and generating a second print ready job file by a second print module based on the input print job file. The first print ready job file is compared to the second print ready job file, and if there is at least one difference between the first print ready job file and the second print ready job file, the input print job file is forwarded to a PSP (printer service provider) that is configured with the first print module or the second print ready job file is forwarded to a PSP that is configured with the second print module.