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					Originally Posted by  Ralph Sir Edward
					 
				 
				A book held by copies for sale, at, say, $10,000 USD for a copy. 
			
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 What happened to eBooks? Isn't it enough that Amazon keeps on selling it in the Kindle format?
Or are you just thinking of older books, say from the 1950's, that are unlikely to be digitized prior to copyright expiration?
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					Originally Posted by  Hrafn
					 
				 
				Also as technology changes decrease the difficulty, cost and ease-of-detection of unauthorized copying, they raise the deadweight cost of enforcing the monopoly, so act as an argument for further reducing the monopoly (possibly by allowing more generous exceptions for non-commercial copying). 
			
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 I find this quite a clever argument. However, you may underestimate how much money was and is spent by governments on arresting and prosecuting  people for shoplifting of copyrighted materials. I would have thought that the 
Copyright Alert System is cheaper because of being automated.
I do have a concern about the lack of mention of books in my last link. Might it be that automated copyright enforcement won't work for books because the minimal needed download bandwidth raises fewer flags? If true, then, by your economic logic, copyright length for movies should be longest, music in-between, and books the shortest. And I don't think too many people here would advocate that.