proprietary

¹pro·pri·e·tary

noun \p(r)ə-ˈprī-ə-ˌter-ē\

plural pro·pri·e·tar·ies

Definition of PROPRIETARY

: something that is used, produced, or marketed under exclusive legal right of the inventor or maker; specifically : a drug (as a patent medicine) that is protected by secrecy, patent, or copyright against free competition as to name, product, composition, or process of manufacture