US Patent 7256902 Network printing system that operates based on the environment

The object is to provide a network printing system in which printing may be executed using stable print modes regardless of the printer operating environment. When the printer receives a print job, if (i) any of the printing parameters in the print mode associated to the print job is registered as prohibited and (ii) the current time is within a designated time frame in which no one is expected to be near the printer, printing using prohibited printing parameters is not performed. The situation in which the printer is kept on suspended for a long period of time is prevented by changing such printing parameters to other available printing parameters, or by deleting the print job.