A method for printing a print ready file on an imaging device, the method being performed by the imaging device and comprising: receiving, from a print client, a print data file that includes information pertaining to the print ready file and information pertaining to the imaging device, the information pertaining to the imaging device included in the print data file including a serial number and a timestamp; determining (208, 400) if the print data file is authentic; and enabling the print ready file to be printed if the print data file is determined to be authentic and invalidating the print ready file if the print data file is determined to not be authentic, wherein determining if the print data file is authentic comprises: obtaining the serial number of the imaging device; comparing the serial number included in the print data file with the serial number of the imaging device; determining that the print data file is not authentic if the serial number comparison reveals that the serial number included in the print data file differs from the serial number of the imaging device; obtaining the timestamp of a last job printed on the imaging device; comparing the timestamp included in the print data file with the obtained timestamp; and determining that the print data file is not authentic if the timestamp comparison reveals that the obtained timestamp exceeds the timestamp included in the print data file. receiving, from a print client, a print data file that includes information pertaining to the print ready file and information pertaining to the imaging device, the information pertaining to the imaging device included in the print data file including a serial number and a timestamp; determining (208, 400) if the print data file is authentic; and enabling the print ready file to be printed if the print data file is determined to be authentic and invalidating the print ready file if the print data file is determined to not be authentic, wherein determining if the print data file is authentic comprises: obtaining the serial number of the imaging device; comparing the serial number included in the print data file with the serial number of the imaging device; determining that the print data file is not authentic if the serial number comparison reveals that the serial number included in the print data file differs from the serial number of the imaging device; obtaining the timestamp of a last job printed on the imaging device; comparing the timestamp included in the print data file with the obtained timestamp; and determining that the print data file is not authentic if the timestamp comparison reveals that the obtained timestamp exceeds the timestamp included in the print data file. obtaining the serial number of the imaging device; comparing the serial number included in the print data file with the serial number of the imaging device; determining that the print data file is not authentic if the serial number comparison reveals that the serial number included in the print data file differs from the serial number of the imaging device; obtaining the timestamp of a last job printed on the imaging device; comparing the timestamp included in the print data file with the obtained timestamp; and determining that the print data file is not authentic if the timestamp comparison reveals that the obtained timestamp exceeds the timestamp included in the print data file.