This document provides definitions and explanations of key concepts in jurisprudence related to property rights. It discusses the differences between rights in re propria (rights over one's own property) and rights in re aliena (rights over another's property), as well as corporeal and incorporeal rights. The document also examines various theories on the origins and nature of property, including natural law theory, labor theory, historical theory, and psychological and functional theories. It provides examples of different types of property rights and encumbrances such as copyright, patents, goodwill, leases, and security interests.