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A book is not just an "idea" any more than, say, a bridge is an "idea". Both start out that way, but the end result - a book and a bridge - are concrete expressions of that idea which can certainly be "owned".
"A boy discovering that he is really a wizard and going to a school for wizards" is an idea. The book "Harry Potter and the Philosopher's Stone" is a specific implementation of that idea and a real object which can be owned and protected.
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