Can someone tell me which 'used' OS licenses or CAL's can and/or cannot be
re-sold if no longer needed. And what are the requirements? Please include
open license, enterprise, retail box, oem, upgraded, non-upgraded.

For example, say I have a 2000 Server full retail box, 20 retail 2000 server
CAL's. I buy a new server with 2003 and 20 new 2003 CAL's. No upgrades. Can
I sell the old OS or the old CAL's?

Or same situation but CALs were purchased through Open License.

Steve