QUOTE (zaaboot @ Oct 15 2009, 09:58 PM)

fedora is open Source linux
All linux is open source - essentially there are 2 main licenses for open source GPL or BSD
The GPL (GNU General Public License) is considered a viral license - ie if you make changes to any source code and try to sell any product based on it you have to publish your changes to the code so other people can incorporate those changes.
The BSD (Berkeley Software Distribution) is thought of as a more buisness friendly license - it allows you to do what ever you want with the code including making no changes to it what so ever and selling it - the only thing is you cannot claim you wrote it and you do not need to publish any changes you have made.
In practice i have found BSD license code to be far cleaner and more reliable than GPL'ed and generally most of the time any modifications made to a BSD licensed program are contributed back to the project as a lot of the time it more hassle than it is worth to keep a separate version of something in track with the main program source code. Most of the windows network stack (and almost all other os's) have stuff from the original BSD OS releases - even now many of the little progs in windows like ftp in command prompt still have this code in them - some of it being 30+ years old now!
There are flame wars going on forever about which is the better or correct license to use for an open source project, as long as you are not selling a piece of software or extending it and closing its source there is little difference between either for most people.