I had a old MacBook Pro with Snow Leopard (OS X 10.6), then I bought the update to Lion (OS X 10.7).
Then I bought a new MacBook Pro that already comes with Lion and sold the old MacBook Pro. So, technically, I have two Lion licenses.
From the license contract on the App Store, I read that it (or Mountain Lion at least) is not transferable. I guess that means I can't transfer my license away from my Apple ID.
But I think it makes no sense I have two licenses and the person who bought my old MacBook Pro would have to buy a new (3rd) one to install it and maintain it. Is there any fairer solution? Would that be illegal?
Of course I could just install it using my account or whatever, but I already did that and now he wants to re-install it for whatever reason, and that's basically where all problems started.