Image forming device and image forming program

An image forming device capable of performing an authentication print printing, which is a printout process for performing user authentication using a predetermined authentication device and determining a start of execution of a printout process based on a result of the user authentication;

• the image forming device comprising:
• a communication interface that receives job data from a terminal, communicating with the external terminal;
• a job data property deriving unit that derives a property of a job related to the job data by referencing data contained in the job data other than data explicitly indicating to execute/not to execute the authentication print printing, and outputs the property as job property data;
• an authentication print setting deciding unit that decides whether or not to execute the job related to the job data as the authentication print printing based on the job property data;
• an authentication unit that is the predetermined authentication device;
• a user authentication unit that outputs the result of the user authentication using said authentication unit;
• and
• a job executing unit that executes the job related to the job data based on the result of the user authentication.