From Richard Stallman’s “Transcript of Richard Stallman at the 4th international GPLv3 conference; 23rd August 2006” (FSF Europe: 23 August 2006):
I hope to see all proprietary software wiped out. That’s what I aim for. That would be a World in which our freedom is respected. A proprietary program is a program that is not free. That is to say, a program that does respect the user’s essential rights. That’s evil. A proprietary program is part of a predatory scheme where people who don’t value their freedom are drawn into giving it up in order to gain some kind of practical convenience. And then once they’re there, it’s harder and harder to get out. Our goal is to rescue people from this.