According to Polygon, the iOS version of Eidos' and Square Enix's Deus Ex: The Fall disables firing on jailbroken devices. Fans who just happen to have jailbroken iOS devices complained about the problem on the game's product page and in this Reddit thread. The first installment of Deus Ex: The Fall launched yesterday on iOS for $6.99.
The exact message players gets is:
"We are sorry but you can't fire on jailbroken devices."
Square Enix has not publicly commented on this story. Late last year the U.S. Copyright Office ruled that jailbreaking smartphones is legal, but did not extend the same ruling to tablets. No doubt this problem is part of some sort of scheme to stop players from using pirated versions of the game...