I bought Omnipage Pro 14 a good while back. It has to be activated online, and can only be used on one PC.
However, if you uninstall it, part of it's process is, (or at least seems to be), that during the uninstall process the software goes online and "unactivates" so that it can then be activated again on another machine.
I don't suppose this helps you, unless it's Omnipage you have, (And it doesn't seem like it!)
A careful read of the Eula terms is in order I would think.