It is my opinion that the General Public License is not so much about ``keeping free software free'' as it is about forcing us to accept the extreme Communistic political philosophy of Richard Stallman and others at the Free Software Foundation. The very spirit of the GPL is to attack the very concept of Capitalism and individualism. There is no concept of intellectual property under the terms of the GPL. Your hard work is no more your property than everyone else's.
This last bit simply is not correct. As an author you retain *all* rights of the software you wrote. Remember, it's copyrighted to you as the author. You (as the author) can even make modifications and sell those as a proprietary product (example: sendmail). The paragraph above is mainly political diffamation; the author closes his eyes before the facts.