A Service Level Agreement (SLA) is a formal agreement that defines the level of service expected from the service provider. It may include aspects such as the uptime and support response time.
Software License Templates provide an easy way of creating multiple software license keys with the same characteristics. By creating a template with the expiration date, feature sets, and other parameters, you can create multiple license keys with the same characteristics faster by just choosing the newly created template.
A Software Licensing System refers to the ability to keep track of all instances of a software product. Each person using the software is given a license key. A software licensing server stores information regarding what features that license key should have access to. The application then responds appropriately considering what that particular license key should have access to.