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In page Natural rights and legal rights:

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One criticism of natural rights theory is that one cannot draw norms from facts.[16] This objection is variously expressed as the is-ought problem, the naturalistic fallacy, or the appeal to nature. G.E. Moore, for example, said that ethical naturalism falls prey to the naturalistic fallacy.[citation needed] Some defenders of natural rights theory, however, counter that the term "natural" in "natural rights" is contrasted with "artificial" rather than referring to nature. John Finnis, for example, contends that natural law and natural rights are derived from self-evident principles, not from speculative principles or from facts.[16]