Win 2000 Terminal Server

Windows 2000 Server comes with 2 licenses standard. We have purchased an additional 20 more licesnses. Terminal Server assigned Permanent licenses to the first 22 computers that logged on. My problem is that about 7 of those first computers were systems that were used for testing purposes, and are no longer in use. and now, I have regular users loggin on, and getting temporary licenses that will expire in 90 days. Is there any way to released thos first permanent licenses that were assigned, sothat my regular users can get permanent licenses???