Software that is not free software or semi-free software (the same thing as free software except that it can only be used for non-profit things).
Windows is an example of proprietary software.
ayon kay a thing ika-11 ng Hunyo, 2005
2 more definitions
Proprietary software is software that you are not free to use, copy, modify, and study as you like. It's a form of abuse of users, which sucks and makes people depressed; it gives suits power over creatives.
Skype is extremely proprietary software.
ayon kay your real name! ika-29 ng Hunyo, 2009
Something said to be evil, yet nobody knows why.
Software developed by Microsoft is proprietary software, so it's evil.
ayon kay Ferreira ika-23 ng Nobyembre, 2008