Kant’s Naturrecht Feyerabend lectures are contemporaneous to his Groundwork, which first sketches some key features of his Critical moral philosophy. Evidence of Kant’s Groundwork stands out when his lectures are compared to Achenwall’s Prolegomena and to Kant’s assigned text, Achenwall’s Ius naturae. Kant’s own Critical Rechtslehre, including his theory of property, develops much later, yet these lectures reveal several of Kant’s key issues and problems, his profound disagreements with traditional and contemporaneous natural law, some of his critical resources for radically improving philosophy of law. This chapter focuses on how Kant’s Critical issues and innovations pertain to individual rights to property.