There are a variety of licensing options available for SPSS Modeler. SPSS Modeler Professional and Premium can be licensed by authorized user and concurrent user in both term and perpetual license models. Additionally, SPSS Modeler Professional and Premium have server options available priced in Processor Value Units (PVUs). Additional information on PVUs can be found here.
IBM SPSS Modeler Gold can be licensed in both authorized users and concurrent users and has an additional requirement for IBM SPSS Modeler Gold server, which is priced by PVUs.