Unlimited Portals (Single Host)
The module can be installed on an unlimited number of Portals that are part of ONE (1) DNN Host installation. If you have a single DNN host with multiple portals, and you'd like to install the module on more than 1 portal, then this is the license you'll need.
Enterprise (Unlimited Hosts)
The module can be installed on an unlimited number of Portals and an unlimited number of DNN Hosts. This is the "do-anything" license!