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2.1 What is the real legal meaning of the GNU copyleft?

The real legal meaning of the GNU General Public License (copyleft) will only be known if and when a judge rules on its validity and scope. There has never been a copyright infringement case involving the GPL to set any precedents. Although legal actions have been brought against companies for violating the terms of the GPL, so far all have been settled out of court (in favor of the plaintiffs). Please take any discussion regarding this issue to the newsgroup news:gnu.misc.discuss, which was created to hold the extensive flame wars on the subject.

RMS writes:

The legal meaning of the GNU copyleft is less important than the spirit, which is that Emacs is a free software project and that work pertaining to Emacs should also be free software. “Free” means that all users have the freedom to study, share, change and improve Emacs. To make sure everyone has this freedom, pass along source code when you distribute any version of Emacs or a related program, and give the recipients the same freedom that you enjoyed.