Those guys must not know their own license...
"First of all, by 'free' they mean you can copy, edit, recompile, or give out your code and recompiled programs. It has nothing to do with price, although most of the time you can get software because someone else will have given it out for free to you. Second of all, FreeBSD is a different flavor of Unix. If you want rock-solid security, you need Open Source. It's that simple. Windows XP is simply too vulnerable to attacks, and even if tonight we all got a patch for them, we'd still be vulnerable because new holes could be discovered - closed source means only Billy Boy can patch them up, Open Source means you can, or you can beg your friends to if you don't know C/C++. Third of all, BSD and Linux run two different liscenses. Linux is GNU, meanning completely free. Under the BSD liscense, you can mess with the code, so long as you don't claim your rights to it. It's kind of like this: GNU is completely and totally anarchist, and the BSD liscense has some kind of predefined order. They both have ups and downs. Since linux is more popular at the time, more people have gotten around to make their own variants of it. Check out www.linuxiso.org and see what I mean."