olemus
tarkvara, mida ta õiguste omanik litsentsib kasutamiseks,
tavaliselt lähtekoodita ning teatud kitsendustega, näiteks
keelates muutmise, ühiskasutuse, edasimüügi, sisu uurimise, pöördkonstrueerimise; ei tarvitse olla kommertstarkvara
= software that its rights holder licenses for use, usually without source code and with certain restrictions, such as prohibiting modification, sharing, resale, content exploration, reverse engineering; does not have to be commercial software

ülevaateid
https://www.techopedia.com/definition/4333/proprietary-software

https://en.wikipedia.org/wiki/Proprietary_software

https://en.wikipedia.org/wiki/List_of_proprietary_source-available_software

https://en.wikipedia.org/wiki/List_of_formerly_proprietary_software

https://www.upcounsel.com/proprietary-software-license

https://www.ijser.org/researchpaper/Open-Source-Software-Vs-Proprietary-Software.pdf

alternatiive
https://whdb.com/blog/proprietary-programs-and-open-source-alternatives/

http://blog.iwayvietnam.com/tuanta/2008/02/top-50-proprietary-software-and-their-open-source-alternatives/

https://gitlab.com/linuxcafefederation/awesome-alternatives/-/blob/master/README.md

vt ka
- avalik tarkvara
- lähtekoodtarkvara
- vaba tarkvara