RMS: «When we call software “free,” we mean that it respects the users' essential freedoms: the freedom to run it, to study and change it, and to redistribute copies with or without changes [...] As the advocates of open source draw new users into our community, we free software activists have to work even more to bring the issue of freedom to those new users' attention.

Free software is simply software that respects our freedom -- our freedom to learn and understand the software we are using.

"...Free software is software that gives you the user the freedom to share, study and modify it. We call this free software because the user is free. To use free software is to make a political and ethical choice asserting the right to learn, and share what we learn with others. Free software has become the foundation of a learning society where we share our knowledge in a way that others can build upon and enjoy..."

"Copyleft is a general method for making a program or other work free, and requiring all modified and extended versions of the program to be free as well. The simplest way to make a program free software is to put it in the public domain, uncopyrighted. This allows people to share the program and their improvements, if they are so minded.

Software always has bugs, and free software is no exception to this. When we think of free software, we think of software we can distribute, modify, study and of course, run. I don't spend a lot of my time studying or modifying free software, to be honest. There are lot of people who do this, and they're a lot smarter than me... well, most of them. Apparently, none of the people who write free software bug trackers ever actually use them to report a bug, or if they do, they have a very high tolerance for pain and annoyance.

The free software community understands that free software gives the user more freedom than proprietary software. Proprietary software confines its users, prohibits them from making changes that would allow everyone to benefit, etc. Free software advocates (myself included) have a habit of claiming that using free (libre) software means the same thing as having freedom.

Free software is software you can study, modify and share without restriction. But unlike proprietary software, there is no big budget marketing campaign behind it. Rather, people discover it and come to value the freedom it provides. What are these people's motivations for working on free software? Why is community and sharing so important? Why should everyone be using free software?

"...Created and maintained by Richard Stallman and the Free Software Foundation, the same organization that maintains the GFDL, the GPL allows licensees to freely distribute copies and modifications provided a number of requirements are followed. One major restriction is that any derivatives or verbatim copies must be licensed under the GPL too (the GPL has a viral clause, similar in spirit to the GFDL)..."

"..RMS’s other mission here is to promote the Free Software Movement. The creator of the GPL...is at pains to correct misunderstandings of what the term free software means and to draw a distinction between it and the open source movement.