Kalium should have linked this page in his initial answer, rather than just assuming that you would understand the distinction -- which does not really, as yet, have much currency beyond those who work in software development or system administration.
The gist of it is that there is a difference between free software and Free Software. The first is "free" in the sense that "free beer" is free. The second is "Free" in the sense that "free speech" is free. In more concrete terms, if users of the software do not have access to the source code for the software, and do not have the right to modify that source code and change the software to fit their own needs, it's not Free, however little it costs to acquire.
hth,
--K


