/prəˈpraɪəteri/
pro·pri·etary
BrE /prəˈpraɪətri/
NAmE /prəˈpraɪəteri/
[usually before noun]
(of goods)
made and sold by a particular company and protected by a registered trademark
a proprietary medicine
proprietary brands
a proprietary name
relating to an owner or to the fact of owning sth
The company has a proprietary right to the property.