Information about the service usage license is defined by the "/service/license" element in the basic package metadata (APP-META.xml). The element format is defined by the Specification in section 5.2.2 License Agreement.
If the "/service/license" element has the must-accept="true" attribute, the Controller should accompany displaying the license text with a user dialogue which enables the user to accept the license terms, and continue provisioning the service only if the license is accepted.