Image forming apparatus, authentication information managing system, authentication information managing method, and authentication information managing program

A processing method in an image forming apparatus, which communicates through a communication medium with an authenticating server having a storage which stores user identification information, the method comprising:

• reading information stored in a storing medium;
• receiving the user identification information;
• obtaining storing medium identification information based on the information read in the reading step;
• transmitting a request to the authenticating server to delete the storing medium identification information stored corresponding to user identification information of a second user, causing an authentication by using the storing medium by the second user to fail, when it is determined that the obtained storing medium identification information indicates that the storing medium is temporarily allocated to a first user and the obtained storing medium identification information is already stored in the storage of the authenticating server in correspondence to user identification information of the second user;
• and
• transmitting a registering request including (a) the obtained storing medium identification information and (b) the user identification information to the authenticating server, in order to store the obtained storing medium identification information into the storage in correspondence to the received user identification information, as a storing medium identification information for the storing medium temporarily allocated to the first user.

A non-transitory computer-readable storing medium storing a computer-executable program for causing a computer to perform a processing method in an image forming apparatus, which communicates through a communication medium with an authenticating server having a user information storage that stores user identification information, the processing method comprising steps of:

• reading information stored in a storing medium;
• receiving the user identification information;
• obtaining storing medium identification information based on the information read in the reading step;
• transmitting a request to the authenticating server to delete the storing medium identification information stored corresponding to user identification information of a second user, causing an authentication by using the storing medium by the second user to fail, when it is determined that the obtained storing medium identification information indicates that the storing medium is temporarily allocated to a first user and the obtained storing medium identification information is already stored in the user information storage of the authenticating server in correspondence to user identification information of the second user;
• and
• transmitting a registering request including (a) the obtained storing medium identification information and (b) the user identification information to the authenticating server, in order to store the obtained storing medium identification information into the user information storage in correspondence to the received user identification information, as a storing medium identification information for the storing medium temporarily allocated to the first user.