Coming from a corporate background, I know a bad management devised idea when I see it.  This one could make a weeks worth of Dilbert strips.

"It turns out that Ubisoft implented code into the [Rainbow 6] RVS 1.5 patch which checks PCs for ANY clone or virtual drive programs and then fails to launch the game if such devices or programs are found."

Update: Quickly coming to their senses, patch version 1.51 released.