Front Page Titles (by Subject) SECTION VII.: Objection Seventh. - The Law of Intellectual Property; or An Essay on the Right of Authors and Inventors to a Perpetual Property in their Ideas
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SECTION VII.: Objection Seventh. - Lysander Spooner, The Law of Intellectual Property; or An Essay on the Right of Authors and Inventors to a Perpetual Property in their Ideas 
The Law of Intellectual Property; or An Essay on the Right of Authors and Inventors to a Perpetual Property in their Ideas (Boston: Bela Marsh, 1855).
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It is said that two men sometimes make the same invention; and that it would therefore be wrong to give the whole invention to one.
The answer to this objection is, that the fact that two men produce the same invention, is a very good reason why the invention should belong to both; but it is no reason at all why both should be deprived of it.
If two men produce the same invention, each has an equal right to it; because each has an equal right to the fruits of his labor. Neither can deny the right of the other, without denying also his own. The consequence is, that they must either use and sell the invention in competition with each other, or unite their rights, and share the invention between them. These are the only alternatives, which their relations to each other admit of. And it is for the parties themselves, and not for the government, to determine which of these alternatives they will elect. Each holds the whole invention by the same title—that of having produced it by his labor. Neither can say that the title of the other is defective, or in any way imperfect. Neither party has any right, therefore, to object to the other’s using or selling the invention at discretion. And each, therefore, can lawfully and freely use and sell the invention, (and give a good title to the purchaser,) without any liability to answer to the other as an infringer. In short, the parties stand in the relation of competitors to each other; each having an equal and perfect right to use and sell the invention, in competition with, and in defiance of, the other. But as such competition would probably not be so profitable to either of the parties, as a union of their competing rights, such a union would doubtless generally be agreed upon by the parties themselves, without any interference from the government.