What is the meaning of Nonproprietary?

Lacking proprietary value; not private or privileged information; not owned by anyone (not anyone's property, whether intellectual property or otherwise).

1. Not protected by trademark, patent, or trade secret and thus open to commercial use without license; said of drugs (medications) and of various kinds of goods and materials.

   Not protected by trademark, patent, or trade secret and thus open to commercial use without license; said of drugs (medications) and of various kinds of goods and materials.

   A drug that is not proprietary.

   Source: wiktionary.org