IPA: //nɒnprəˈpraɪəˌtɛri//
KK: /nɑnprəˈpraɪəˌtɛri/
Describing something that is not owned by a specific person or company and is available for public use.
The software is nonproprietary, allowing anyone to modify and distribute it freely.
Nonproprietary → It is formed from "non-" (meaning not), "proprietary" (from Latin "proprietarius", meaning owner or property). The word "nonproprietary" means not owned or not restricted to a particular owner.
Think of 'not' ('non-') being related to 'ownership' ('proprietary') — that's why nonproprietary refers to something that is not owned.