Copyright
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With an account, you can revise, criticize, and comment on ideas.To keep someone from copying your work you have to infringe on the private property of that person by claiming an exclusive right on prohibiting his use of his privately owned copying medium to instantiate a certain pattern.
‘To stop someone from murdering you you have to infringe on his private property by claiming an exclusive right on prohibiting his use of his privately owned gun to shoot you’ How is that different?
Murdering someone destroys their scarce property (their body in this case). Copying something using your own property leaves the original totally untouched.
One can steal value without stealing physical property (as happens when you transfer someone’s digital money without their consent).
The issue is scarcity. Digital money is also scarce since you cannot double spend it. If it wasn't scarce, it wouldn't be money and neither would it be private property.
But digital money isn’t physically scarce like someone’s body. Your argument rests on physical property being special in some way.
I don’t think the issue hinges on whether something is physically scarce, whatever that’s supposed to mean. After all, all information is physical, as David Deutsch likes to emphasize. The real distinction is this: stealing someone’s digital money deprives them of the ability to use it, while copying someone’s novel does not prevent the author from accessing or using their own work. The former is zero-sum; the latter is not.
If you take an idea from me and produce a derivative work you may change the value of my copy.
It need not necessarily be a decrease in value. For example, a novel derivative work created by you may increase purchases of my works. Alternatively, your work may tarnish the brand associated with my work, or even directly compete with me, and reduce my sales.
I may not want to take this risk. I ask you not to take such actions in exchange for me sharing a copy with you (with agreed restrictions). If you accept and breach the agreed restrictions, you have violated our contract.