I have three different computers that I want to use for editing with VPX. Two of them are already activated. One is my desktop at my office, the other is my laptop at home. Now, I just purchased a second laptop (i.e. a third device) and I want to be able to use VPX on it too from time-to-time. Can I just add it to my list of computers or do I have to remove one of my other computers to use VPX on this new laptop?