Generally, a software license is focused on "usage", not on installation. As long as it's just used by one user at any given time, it can be installed on as many computers as you want. If it's just installed on one computer, it is obvious: only one person can use it at any given time. If it serpentis or his brother that does it doesn't matter. I have Poser and all my Poser stuff installed on both my stationary PC and my lap top. I don't want to be witout Poser when I travel! But I'm the only one using these two computers, so I can't see that I would need two licenses of any of the products I have. When having large corporate license agreements for various software, you quite often have "floating" licenses. Everyone has the software installed, but the network keeps track of how many are using it at any given time and makes sure that the number never esceeds the number of licenses the company pays for. You can see the same logic here: it's the usage of the software that counts, not the number of installations.