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.
by your real name! June 29, 2009
by Ferreira November 23, 2008
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).
by a thing June 11, 2005