Controlling issuance of RDS CALs

Problem:
Running out of RDP licensing for your terminal servers.  Win 2008 & Win 2008 R2 licenses.  You need to restrict/control what servers are allowed to get RDP licenses from the your pool of licenses. 

Solution:
On the license server, there is a local security group called Terminal Server Computers.  Add the client servers (computer names) that are allowed to get RDP licensing for their clients to the security group.  Once all the servers are in the group, enable policy "License server security group" found in Computer Configuration\Policies\Administrative Templates\Windows Components\Remote Desktop Services\RD Licensing using GPEDIT.MSC. 

Caveat:
This solution should only be done when Licensing server is a domain member.

Reference:
http://technet.microsoft.com/en-us/library/cc725704.aspx