EFYTimes.com has a nice, short interview up with RMS: The GNU general public license is a copyleft license. It means that it requires the free distribution (with or without changes) be under the same license. In effect, it says, you can distribute this code to others but you must respect their freedom the same way we respect your freedom. Looking at the same thing from a different point of view, it means that the man who provided a software copy to you must respect your freedom the same way he took advantage of the freedom given to him. Without copyleft,… Continue Reading

Matthias Ettrich started KDE back in 1996. Here is Matthias original post that started it all on com.os.linux.misc  . When KDE 4.0 was released in 2008, there was an interview about KDE and Matthias vision: Interview from 2008.

Richard Stallman, father of the GPL explains the 4 freedoms:

Famous interview, where Linus Torvalds is asked about Linux and its relationship to Microsoft: