"proprietary" in the noun sense
1. proprietorship, proprietary
an unincorporated business owned by a single person who is responsible for its liabilities and entitled to its profits
"proprietary" in the adjective sense
1. proprietary
protected by trademark or patent or copyright made or produced or distributed by one having exclusive rights
"`Tylenol' is a proprietary drug of which `acetaminophen' is the generic form"
Source: WordNet® (An amazing lexical database of English)
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