Sure...
http://www.hexus.net/content/item.php?item=20991
Last bit down at the bottom there. Eidos was legally prohibited by Nvidia from removing the VendorID lock despite the fact that they wanted to remove it for the good of their customers. That e-mail was also published elsewhere but I don't have time currently to do a proper google search for it.
Also reference various threads about end users removing the VendorID to enable working in game AA on ATI cards which triggers the games DRM preventing the user from saving their games.
Reference also that AMD attempted multiple times to enable in game AA both before and after the games release.
Also various articles mentioning Nvidia's "proprietary" IP protected AA method used in Batman: AA is amazingly similar to standard methods of providing AA for the rendering method used.
Regards,
SB