Webster's English Dictionary

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proprietary

1. pro.pri.etary \p(r)*-'pri--*-.ter-e-\ n 1a: PROPRIETOR, OWNER  1b: an 
   owner or grantee of a proprietary colony  2: a body of proprietors  3: a 
   drug that is protected by secrecy, patent, or copyright against free c 
   ompetition as to name, product, composition, or process of manufacture
2. proprietary aj [LL proprietarius, fr. L proprietas property - more at 
   PROPERT]Y 1: of, relating to, or characteristic of a proprietor  2: made 
   and marketed by one having the exclusive right to manufacture and  sell 3: 
   privately owned and managed