<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Natural and legal rights are two types of rights . Natural rights are those that are not dependent on the laws or customs of any particular culture or government, and so are universal and inalienable (they cannot be repealed or restrained by human laws). Legal rights are those bestowed onto a person by a given legal system (they can be modified, repealed, and restrained by human laws). </P> <P> The concept of natural law is related to the concept of natural rights . Natural law first appeared in ancient Greek philosophy, and was referred to by Roman philosopher Cicero . It was subsequently alluded to in the Bible, and then developed in the Middle Ages by Catholic philosophers such as Albert the Great and his pupil Thomas Aquinas . During the Age of Enlightenment, the concept of natural laws was used to challenge the divine right of kings, and became an alternative justification for the establishment of a social contract, positive law, and government--and thus legal rights--in the form of classical republicanism . Conversely, the concept of natural rights is used by others to challenge the legitimacy of all such establishments . </P>

Rights which are based upon laws of nature