Yes, it would require labor to make the scarce good become non-scarce, but the question is whether you have the right to stop others from using their own labor to turn non-scarce goods into the same scarce good that you did.
As for your novel, once your recombination of words enters anyone else's head, its scarcity is no longer under your control - trusted friend or not - unless you get a monopolistic force involved. Until that point, anyone who isn't you could perfectly argue that your novel doesn't actually exist... and you can't prove that it does until someone else reads it.
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