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Part of the Open source glossary: Also see open and Open Source. In information technology, proprietary describes a technology or product that is owned exclusively by a single company that carefully guards knowledge about the technology or the product's inner workings.n information technology, proprietary describes a technology or product that is owned exclusively by a single company that carefully guards knowledge about the technology or the product's inner workings.
proprietary adjective [before noun]. âº MARKETING, COMMERCE used to describe a âproduct that is made and âsold by a particular âcompany whose âname, or a âname that it âowns, is on the âproduct: The âproducts were âdeveloped using two proprietary and âpatented âtechnologies. ârelating to âowning something, or ârelating to or like an âowner: I just âassumed he âowned the âplace-he had a proprietary âair about him. âº Proprietary âgoods are made and âsent out by a âparticular âcompany whose âname is on the âproduct: proprietary âmedicines.