It's possible that the current ones are still based on the work of Apple's Advanced Technology Group. Apple used HTC over its patents and this article about the

It's possible that the current ones are still based on the work of Apple's Advanced Technology Group. Apple used HTC over its patents and this article about the suit mentioned the technology being added back in 10.5: http://forums.appleinsider.com/showthread.php?t=138975 http://forums.appleinsider.com/showthread.php?t=138975