ha esetleg még mindig nem lenne világos, akkor idéznék a WMS site-ról:
"Licensing for Windows Media Services is covered by the Windows Server 2003 end-user license agreement (EULA). A separate client access license (CAL) is not required for Windows Media Services. If you are using Windows Media Services to deliver unicast or multicast streams from a server running Windows Server 2003, you are only required to license the server product."