Patent ID: 8456670

Claim:
A printing device for receiving authentication printing data transmitted by a host device through a communication network and printing an image based on the authentication printing data on a recording medium, comprising: a receiving part configured to receive the authentication printing data and user information from the host device; a memory part configured to store the authentication printing data an the user information; a device specifying part configured to specify a position on the communication network of the host device by using the user information that was received at the receiving part; a condition monitoring part configured to monitor a device condition of the host device, which is a transmission source of the authentication printing data, specified by the device specifying part; an authentication information inputting part configured to accept an input of authentication information by the user; a judging part configured to judge whether or not the authentication printing data and the user information need to be deleted based on a monitoring result of the condition monitoring part, and to judge whether or not to approve printing of the image based on the authentication printing data by collating the authentication information that was received by the authentication information inputting part and the user information attached to the authentication printing data; a deleting part configured to delete, based on a judgment of the judging part, the authentication printing data and the user information stored in the memory part; and a printing part configured to print the image on the recording medium based on the authentication printing data and based on the judgment of the judging part.