One of the most frequently asked questions when I was working with SharePoint 2010 was “Can we have both standard and enterprise client access licenses (CALs) in the same SharePoint Farm?”. The answer was always yes but with a follow on discussion. The discussion dove into the challenges for an organization to track and ensure that the users licensed with a standard CAL were not accessing enterprise CAL features. In SharePoint 2010 organizations were limited to setting up site collections and sites around CAL types. This type of architecture introduced may issues and blocked some people from easily collaborating with each other.
In SharePoint 2013 a new concept was introduced that enables an organization to define license groups in AD and then map them to specific license types in SharePoint. This new model has made it much more easier for an organization to track SharePoint licenses, maintain license compliance, and provide better collaboration capabilities to end users.
The video below walks through the simple process of configuring SharePoint 2013 licensing.
For more information you can check out an article published on TechNet called Configure Licensing in SharePoint Server 2013.