1. SharePoint Foundation 2013
2. SharePoint Server 2013 - Standard CAL
3. SharePoint Server 2013 - CAL Enterpriese
Also, Sharepoint 2013 is designed in such a way that if auser doesn’t have an appropriate license, the system will let the user knowthat the particular feature is not available and make sure that the userexperience is not lost.
The graphic below illustrates the differences in theirrespective features:
Image may be NSFW.
Clik here to view.
SharePoint Foundation 2013 enables the building of teamsites, the basic functions for the search and the ability to use the BusinessConnectivity Services. The Enterprise CAL is the availability ofbusiness service applications, such as Access, Visio or Forms Services and theBI capabilities.
SharePoint (On-Premise) is licensed through the volumelicensing program and may be obtained from one of the following license types: Open,Select Plus and Enterprise Agreement . TheOpen License Program is not bound by any contract, the software can be orderedas needed and paid directly. The Select Contracts are generally tied to athree-year term, but have a higher discount than Open. With the EnterpriseAgreement (EA), the highest discount level can be achieved. With EAcontract the entire company is covered, including Software Assurance. Formore information about volume licensing programs are available on the officialwebsite to find Microsoft.