You will probably have to contact MI support when you install it to get a new license key. (I believe the key is tied to some hardware ID on the actual PC, not the IP address.) Last year we moved one license from another facility to this one, and I think there was a 1-day turnaround from when I filed a request and I got the email with the new key - it was no big deal.
It isn't the name of the system - I can attest to that. I was given a short-gap system at my new job a few months ago until my permanent system arrived.
It had the same system name as the previous one once setup was complete, but the locking code was vastly different. It seems to be more of a combination of Hardware and System info than anything else (reminiscent of MS activation).
A call to Mercury resulted in a new license for the system within 3 days, so there shouldn't be any problem to speak of moving the application over to a new system.
Insanity: doing the same thing over and over again and expecting different results
There is a specific procedure that you follow from MI to get a LOCKING CODE and it is specific from machine to machine. Call MI they will instruct you.
Quality is the result of a carefully constructed cultural environment. It has to be the fabric of the organization, not part of the fabric.