Inalienable or natural rights are those not contingent upon the laws, customs, or beliefs of any particular culture or government, and therefore universal and inalienable (i.e., rights that cannot be repealed or restrained by human laws).
legal privileges are those bestowed onto a person by a given legal system (i.e., they can be modified, repealed, and restrained by human laws).
The concept of natural law is closely related to the concept of natural rights. 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. Constitutions and governments do not grant rights, they merely enumerate them.