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			One thing I  had been wondering generally was how long a "shelf life" the film rights had.  Given that copyright on books and songs expire after a certain period of time it would seem unlikely that film rights could be held in perpetuity.  Is there a general rule or would it be contract specific?
		 
		
		
		
		
		
		
			
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				“But Finrod walks with Finarfin his father beneath the trees in Eldamar.” 
 
Christopher Tolkien, Requiescat in pace 
			 
		
		
		
		
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