MysterD: Shacknews speaks on GameStop DRM scheme and their optional "insurance policy":
http://www.shacknews.com/onearticle.x/63141 Each purchase includes three licenses, which, according to GameStop, "means you may install the game on other computers and activate it up to 3 times."
Be forewarned that GameStop will automatically add a $3.95 "Download Insurance" charge to your cart alongside the game--meant to ensure that "a back up copy of these Digital Good(s) will be available to you for download for up to eighteen (18) months from the date of purchase"--though this can be removed.
Oddly, it's not clear how long the download will be available if that insurance is not purchased