Windows Server Auxiliary Protocols
Microsoft also offers a license that grants rights to use certain Windows Server operating system protocols that are outside the scope of other agreements.
At the current time, these protocols include:
Atom Publishing Protocol: Data Services URI and Payload Extensions
Conceptual Schema Definition for the Entity Data Model
Session Multiplex Protocol
For MCPP licensees, these protocols are also available as an addendum to their main agreement. For more information about MCPP, please visit this site.