Ubisoft has confirmed how the Digital Rights Management (DRM) will work for the
PC version of Far Cry 2 and darn, it makes a lot of sense. With all the
kerfuffle surrounding the DRM being used in the likes of Spore, Electronic Arts could learn a lesson or two on how not to alienate your user-base.
Here's how it works - you get five installations on three machines. The clincher, as explained by "Ubi.Vigil", Ubisoft's UK Community Manager, goes as follows - "Uninstalling the game 'refunds' an activation. This process is called 'revoke', so as long as you complete proper uninstall you will be able to install the game an unlimited number of times on 3 systems."
The revoke system, therefore, means you can upgrade your computer as many times as you want - so long as you remember to uninstall first. If you're terminally forgetful or find your hard drive repeatedly self destructs, Ubisoft states that it can also provide additional activations.
Simple, eh?
Source: Ubisoft Forum