“The GNU GPL was not designed to be ""open source"". I wrote it for the free software movement, and its purpose is to ensure every user of every version of the program gets the essential freedoms.”

— Richard Stallman

""Re: GPL version 4"" on NetBSD mailing list (17 July 2008) http://mail-index.netbsd.org/netbsd-users/2008/07/17/msg001546.html
See http://www.gnu.org/philosophy/open-source-misses-the-point.html for more explanation of the difference between free software and open source.
2000s

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American software freedom activist, short story writer and … 1953

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“The GNU GPL is not Mr. Nice Guy. It says "no" to some of the things that people sometimes want to do. There are users who say that this is a bad thing — that the GPL "excludes" some proprietary software developers who "need to be brought into the free software community."
But we are not excluding them from our community; they are choosing not to enter. Their decision to make software proprietary is a decision to stay out of our community. Being in our community means joining in cooperation with us; we cannot "bring them into our community" if they don't want to join.
What we can do is offer them an inducement to join. The GNU GPL is designed to make an inducement from our existing software: "If you will make your software free, you can use this code."”

Richard Stallman (1953) American software freedom activist, short story writer and computer programmer, founder of the GNU project

Of course, it won't win 'em all, but it wins some of the time.
1990s, Copyleft: Pragmatic Idealism (1998)

“I'd just like to interject for a moment. What you’re referring to as Linux, is in fact, GNU/Linux, or as I’ve recently taken to calling it, GNU plus Linux. Linux is not an operating system unto itself, but rather another free component of a fully functioning GNU system made useful by the GNU corelibs, shell utilities and vital system components comprising a full OS as defined by POSIX. Many computer users run a modified version of the GNU system every day, without realizing it. Through a peculiar turn of events, the version of GNU which is widely used today is often called “Linux”, and many of its users are not aware that it is basically the GNU system, developed by the GNU Project. There really is a Linux, and these people are using it, but it is just a part of the system they use. Linux is the kernel: the program in the system that allocates the machine’s resources to the other programs that you run. The kernel is an essential part of an operating system, but useless by itself; it can only function in the context of a complete operating system. Linux is normally used in combination with the GNU operating system: the whole system is basically GNU with Linux added, or GNU/Linux. All the so-called “Linux” distributions are really distributions of GNU/Linux.”

Richard Stallman (1953) American software freedom activist, short story writer and computer programmer, founder of the GNU project

Internet meme commonly attributed to Stallman made by an unknown source.
Misattributed

“As one person put it, "Open source is a development methodology; free software is a social movement."”

Richard Stallman (1953) American software freedom activist, short story writer and computer programmer, founder of the GNU project

1990s, Why "Free Software" is better than "Open Source" (1998)
Context: While free software by any other name would give you the same freedom, it makes a big difference which name we use: different words convey different ideas.
In 1998, some of the people in the free software community began using the term "open source software" instead of "free software" to describe what they do. The term "open source" quickly became associated with a different approach, a different philosophy, different values, and even a different criterion for which licenses are acceptable. The Free Software movement and the Open Source movement are today separate movements with different views and goals, although we can and do work together on some practical projects.
The fundamental difference between the two movements is in their values, their ways of looking at the world. For the Open Source movement, the issue of whether software should be open source is a practical question, not an ethical one. As one person put it, "Open source is a development methodology; free software is a social movement." For the Open Source movement, non-free software is a suboptimal solution. For the Free Software movement, non-free software is a social problem and free software is the solution.

“The official definition of "open source software," as published by the Open Source Initiative, is very close to our definition of free software; however, it is a little looser in some respects, and they have accepted a few licenses that we consider unacceptably restrictive of the users.”

Richard Stallman (1953) American software freedom activist, short story writer and computer programmer, founder of the GNU project

1990s, Why "Free Software" is better than "Open Source" (1998)

“To stop using the word "free" now would be a mistake; we need more, not less, talk about freedom.
If those using the term "open source" draw more users into our community, that is a contribution, but the rest of us will have to work even harder to bring the issue of freedom to those users' attention. We have to say, "It's free software and it gives you freedom!"”

Richard Stallman (1953) American software freedom activist, short story writer and computer programmer, founder of the GNU project

more and louder than ever before.
1990s, Why "Free Software" is better than "Open Source" (1998)

“If the users don't control the program, the program controls the users. With proprietary software, there is always some entity, the "owner" of the program, that controls the program—and through it, exercises power over its users. A nonfree program is a yoke, an instrument of unjust power.”

Richard Stallman (1953) American software freedom activist, short story writer and computer programmer, founder of the GNU project

Free Software Is Even More Important Now (September 2013) https://www.gnu.org/philosophy/free-software-even-more-important.html
2010s

“I never imagined that the Free Software Movement would spawn a watered-down alternative, the Open Source Movement, which would become so well-known that people would ask me questions about "open source" thinking that I work under that banner.”

Richard Stallman (1953) American software freedom activist, short story writer and computer programmer, founder of the GNU project

2000s, Thus Spake Stallman (2000)

“At present, we have plenty of "keep quiet", but not enough freedom talk. Most people involved with free software say little about freedom — usually because they seek to be "more acceptable to business." Software distributors especially show this pattern. Some GNU/Linŭ operating system distributions add proprietary packages to the basic free system, and they invite users to consider this an advantage, rather than a step backwards from freedom.”

Richard Stallman (1953) American software freedom activist, short story writer and computer programmer, founder of the GNU project

1990s, Why "Free Software" is better than "Open Source" (1998)

“The term "free software" has an ambiguity problem: an unintended meaning, "Software you can get for zero price," fits the term just as well as the intended meaning, "software which gives the user certain freedoms."”

Richard Stallman (1953) American software freedom activist, short story writer and computer programmer, founder of the GNU project

We address this problem by publishing a more precise definition of free software, but this is not a perfect solution; it cannot completely eliminate the problem. An unambiguously correct term would be better, if it didn't have other problems.
1990s, Why "Free Software" is better than "Open Source" (1998)

“I want to make sure that all versions of GNU remain free.”

Richard Stallman (1953) American software freedom activist, short story writer and computer programmer, founder of the GNU project

1980s, GNU Manifesto (1985)
Context: GNU is not in the public domain. Everyone will be permitted to modify and redistribute GNU, but no distributor will be allowed to restrict its further redistribution. That is to say, proprietary modifications will not be allowed. I want to make sure that all versions of GNU remain free.

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