Where does “non-proprietary” come from?

non-proprietary (English) comes from English proprietary, from French propriétaire, from Latin proprietarius, from Latin proprietās, from Latin -tās, from Proto-Indo-European -teh₂ts, from Proto-Indo-European -teh₂, from Proto-Indo-European -tós — Creates verbal adjectives from verb stems.

Ancestry of “non-proprietary”, step by step

non-proprietary traces back through two separate lines of ancestry.

via English proprietary

StepLanguageWordMeaning
1EnglishproprietaryOf or relating to property or ownership; Owning...
2Frenchpropriétaireproprietary; owner
3Latinproprietariusowner
4Latinproprietāsquality, property, peculiarity, character
5Latin-tāsty, -dom, -hood, -ness, -ship
6Proto-Indo-European-teh₂tsUsed to form nouns representing state of being
7Proto-Indo-European-teh₂Used to form nouns representing state of being
8Proto-Indo-European-tósCreates verbal adjectives from verb stems

via English non

StepLanguageWordMeaning
1EnglishnonObsolete form of none
2Frenchnonno; not; a no, a negative response
3Old Frenchnonno; not; Alternative form of nom
4Latinnōnnot
5Old Latinnoenum
6Proto-Indo-Europeanóynosone; single
Every word from Proto-Indo-European -tósEvery word from Latin -tāsEvery word from Latin proprietās