Using Personal Authentication to Manage Printing/Faxing/Remote Scanning via a Computer
You can apply personal authentication management to printing, faxing, and remote scanning (Using Your Computer to Scan (Remote Scan) (Windows)) via a computer. This can provide greater security, as the machine does not accept these operations unless the user is identified.
(Settings/Registration) 
<Management Settings> <User Management> <Authentication Management> <Restrict Job from Remote Device without User Auth.> <On> <OK> (Settings/Registration) (Settings/Registration) <Apply Set. Changes> <Yes>