“Rights are created by agreement (contract) or by the command of the sovereign.”
Nope.
“Ethics - the validity of the principle of self-ownership and original appropriation - is demonstrably not dependent and contingent upon agreement or contract; and the universality claim connected with Rothbard’s libertarianism is not affected in the slightest by the circumstance that moral discussants may or may not always come to an agreement or contract. Ethics is the logical-praxeological presupposition - in Kantian terminology: die Bedingung der Moeglichkeit - rather than the result of agreement or contract. The principles of self-ownership and original appropriation make agreement and contract - including that of not agreeing and contracting - possible. Set in motion and stimulated by the universal experience of conflict, moral discussion and argument can discover, reconstruct, explicate, and formulate the principles of self-ownership and original appropriation, but their validity in no way depends on whether or not this is the case, and if so whether or not these formulations then find universal assent.” - Hoppe, Intro to TEOL.