Conversation so far:
What is the most interesting part of the Richard Stallman article?
Richard Stallman pioneered the concept of copyleft, which uses the principles of copyright law to preserve the right to use, modify, and distribute free software.
Did Richard Stallman make money off his work?
What else did Richard Stallman believe in?
Richard Stallman asks people to say free software and GNU/Linux, and to avoid the terms intellectual property and piracy (in relation to copyright).
What would Richard Stallman prefer intellectual property be called?
Richard Stallman argues that the term intellectual property is designed to confuse people, and is used to prevent intelligent discussion on the specifics of copyright, patent, trademark, and other laws.

Question: Did he think all software should be free?
Self-contained rewrite: Did Richard Stallman think all software should be free?