Originally Posted by Jan Gaarni
The only reason why companies say it's not allowed is because if you do that, they can't sell you another copy should something happen to the first one you bought.
I believe that falls under the "Fair Use" clause. Which I believe has been tested in court(though obviously it was not for copies of games). you can have a copy of any software for which you hold a legitimate license for. Though be careful... you may need multiple concurrent licenses if you have software installed on more than one machine. It depends on the software developer's license agreement that you casually clicked through during install. but wait... I'm sure EVERYONE reads the whole license agreement of every piece of software they install.