proprietary

mastery
UK /pɹəˈpɹaɪ.ə.tə.ɹi/ US /pɹəˈpɹaɪ.əˌtɛɹ.i/adjnoun

card 1 of 10 · synonym

Which word is closest in meaning to 'proprietary' in this sentence?

They fished in a proprietary lake that was off-limits to the public.