Stephan Kinsella, a libertarian legal theorist and patent attorney, is best known for his strong opposition to intellectual property (IP) rights, particularly patents and copyrights. In his influential work, Against Intellectual Property (2008), he argues that IP is incompatible with libertarian principles and property rights. Kinsella contends that ideas and information are not scarce resources like physical property, so granting monopolies over them through IP laws creates artificial scarcity, stifles innovation, and infringes on individual liberty. He asserts that copying or using someone’s idea does not deprive the originator of their property, making IP enforcement a form of coercion that violates the non-aggression principle. Instead, he advocates for a free market where innovation thrives without state-backed IP protections, relying on voluntary contracts and natural incentives. His work has sparked significant debate within libertarian and legal circles, challenging conventional views on IP.