Petition to remove activations based DRM from Stalker Clear Sky

Everyone should know that any hardware changes prompt the game to re-activate and there is a limit per key for activations. Uninstalling does not revoke the key. OS changes will also trigger the need for a re-activation. So basically if you change hardware or reinstall ~5 times you will now need to get the key unlocked or a new one issued - to which GSC and Valve keep referring you to the other with neither company doing anything to resolve it.

Read more over here.