I'm considering creating a custom web app that will use leaflet. People would log in and be able to create new records through a form and perform queries on the rest service through a custom form I will create. The authentication to access the login will be via LDAP but to authenticate to server(which is not federated with portal(we don't use portal) or ldap) I will send a post request to the rest service via a builtin user I have setup(on the backend). Does each person that logs in via our networks ldap need to have their own user on arcgis servers rest service? If so how does the licensing work for that.