It appears Eidos is attempting to combat piracy of Batman: Arkham Asylum by disabling the all-important Glide ability if you aren't running a legitimate version.
In the official Eidos forums under a thread called 'Problem with Glide' a (pirated version) user explains his frustration that when holding space bar on the PC version of the game Batman's Cape remains closed and he falls to his death in poison gas.
To quote: Cheshirec_the_cat: Hi! I've got a problem when it's time to use Batman's glide in the game. When I hold , like it's said to jump from one platform to another, Batman tries to open his wings again and again instead of gliding. So he fels down in a poisoning gas. If somebody could tel me, what should I do there.
Keir (Eidos): The problem you have encountered is a hook in the copy protection, to catch out people who try and download cracked versions of the game for free.
It's not a bug in the game's code, it's a bug in your moral code."
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