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					Originally Posted by  Steve Jordan
					 
				 
				Trying ways to tie documents to devices will, quite simply, never work as a deterrent to file sharing.  All of these schemes are ultimately a wasted effort, doomed to failure. 
 
Unfortunately, we are a long way from security methods that would work (think biometrics) 
			
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 That wouldn't work either.  What copy protection schemes try to do is fundamentally impossible.  Doesn't matter what method or algorithm you come up with, it will be defeated.