from the Oxford English Dictionary:
8. Legal entitlement or justifiable claim (on legal or moral grounds) to have or obtain something, or to act in a certain way; the advantage or profit deriving from this. Now chiefly in to have as much (little, more, etc.) right
9. a. A legal, equitable, or moral title or claim to the possession of property or authority, the enjoyment of privileges or immunities, etc.; (by extension) an entitlement considered to arise through natural justice (whether or not enshrined in legislation) and which is applicable to all members of a particular group.
b. A legal, equitable, or moral entitlement to something.
g. In pl. A title or authority to perform, publish, film, televise, or otherwise disseminate a particular work, event, etc. Cf. COPYRIGHT
11. With possessive adjective
or genitive: a person's (also in extended use, a thing's) entitlement or claim
to something, now esp. political or civil privileges or liberties. Now usu. in
pl. (freq. in
rights of man,
rights of woman (also women);