Compound of formula : 1and their salts, solvates, prodrugs, etc. To accomplish this, in an image processing system of this invention, when the user registers an evidenced document in a server as image data, an MFP decides whether or not to register the evidenced document not only by authentication processing based on a user ID and password, but also by determination processing based on a work identifier used to identify a workflow. Moreover, because this will moderate the burden imposed on the hauler, the number of wrongly hauled goods would be greatly reduced.