I have my copy of Cortex Command installed on a 2GB Kingston USB drive as I often play CC in college as well as at home.
Today while in College I tried to un-register it so that I would be able to play it tonight at home. When I tried to do so it gave me the message:

'Could not contact the license server to un-register'

Anyone have any ideas?

I really want to play now but the 6 minute limit is ghey.

I am willing to bet this is firewall-related, since you tried to play on a college network.

It registered okay. My college has a pretty slack firewall anyway.

Just try registering at home. I could not unregister also when I was playing elsewhere, but as it turns out that didn't stop me from registering at home.
Alternatively, you can try resetting your key at licensing.datarealms.com.

Sweet, didn't know about the licensing reset thing.

Thanks.

i have an opposite problem. i got an unregistered copy and when i used my key to unlock it ill have the registered copy but when if i were to quite then start up again i would have an unregistered copy again meaning i have to type in my key every time i start the game and because its just like im getting a new copy of the game every time i start the game up i cant save any maps that i edit.

Are you saving this on a computer somewhere other than home?
If you are, it's likely that the computer deletes its registries after every session, so you'll have to use the Launcher for Cortex Command (In the B22 topic)

ok i figured it out just needed to put the game into the applications folder.