Zdroje
http://www.vincent.sanet.sk/skola/html/inf/7roc/prax/5hod7.html
https://sk.wikipedia.org/wiki/Demoverzia
http://etika-a-prava.webnode.sk/nieco-k-teme/licencia-a-multilicencia/
https://sk.wikipedia.org/wiki/Open-source_softv%C3%A9r
http://soft-firma.webnode.sk/registracia-softveru/
https://sk.wikipedia.org/wiki/Public_domain
https://sk.wikipedia.org/wiki/Shareware
https://managementmania.com/sk/upgrade-softveru
https://sk.wikipedia.org/wiki/Adware
http://maturitneotazky.sk/default/informatika/10-otvoreny-softver