This document summarizes the natural theory of rights. The natural theory is considered the oldest theory of rights, advocated by thinkers like John Locke, Thomas Paine, Hobbes, and Rousseau. According to the theory, rights come from nature, not human laws, and are based on universally accepted natural laws. Thomas Paine and John Locke argued that natural rights include liberty, property, security, and resistance to oppression. However, the theory is criticized for being vague about what is meant by "natural" and for ignoring the importance of society and the state as sources of rights. It also fails to account for the fact that rights can conflict and change over time.