Meaning

noun an unincorporated business owned by a single person who is responsible for its liabilities and entitled to its profits

adjective protected by trademark or patent or copyright; made or produced or distributed by one having exclusive rights

originFrom French propriétaire, from Latin proprietārius. By surface analysis, propriety + -ary. Compare with the Latin proprietas (“property”) and proprius (“ownership”).

Etymology from Wiktionary, CC BY-SA 3.0