Installation - what for ?

my father actually asked me how can he 'illegally' copy a program from the office computer back to home PC for usage. I thought about it and then only i realized the reason behind the concept of installation... hey, I got a degree in IT but now only i understand the real purpose.. Hadn't there been any installation, we would be copying and borrowing program like crazy... and there would be no sales otherwise. So the purpose of installation, is really to prevent people like my father from doing what he wanted to do.. I would never thought about this because my mind been educated to install program and not to copy program.

So I told him it is not possible and he would need to get the installation CD.