an item or idea that is used, made, or marketed by one who has a legal right (e.g. is protected by secrecy, patent, or copyright);
e.g. The Coca-Cola formula is proprietary information and kept secret from the public.
(adjective)
characteristic of an owner or title holder, or is used, made, or marketed by one having the exclusive legal right - privately owned and managed and run as a profit-making organization;
e.g. They had proprietary rights over the organization.