What I personally would and would not do isn't terribly relevant for anyone but me.
I find the model of copyright used here in Norway to be fairly reasonable, with the exception that the protection-time is MUCH too long.
Here, such incidental copies that are required for the normal use of a legally aquired work, are allowed. This includes installing software from a DVD onto a hard-disc, loading that program into RAM, and also taking a complete backup of a machine with the program installed. (all of these things fall under "normal use")
But all this is nitpicking - and nitpicking that by its nature is jurisdiction-specific. Even if you're unlucky enough to live somewhere where you do need permission to use a program you legally aquired, then that's still not a problem because the GPL grants such a permission. In practical terms it's impossible to break the GPL by making multiple copies of the software for your own use -- what would you do: refuse to give yourself the sourcecode ?
In short, unless you distribute GPLed software - or derivative works, you don't need to agree to anything in particular to use the software for anything you like.