Some libertarian natural rights theorists justify property rights in ideas and other intangibles just as they do property rights in physical goods, saying whoever made it owns it. Other libertarian natural rights theorists such as Stephan Kinsella have held that only physical material can be owned and that ownership of IP amount to an illegitimate claim of ownership over that which enters another's mind that cannot be removed or controlled without violation of the non-aggression axiom.
Some libertarian natural rights theorists justify property rights in ideas and other intangibles just as they do physical goods, arguing that whoever creates it owns it. Other libertarian natural rights theorists, such as Stephan Kinsella, maintain that only physical material can be owned and that claims of ownership over intellectual property amount to an illegitimate claim over what cannot be removed or controlled without violating the non-aggression axiom.