I believe the FSF are interested in liberty rather than "true freedom" (at least in my understanding of the terms). I believe Stallman originally wanted to cal

I believe the FSF are interested in liberty rather than "true freedom" (at least in my understanding of the terms). I believe Stallman originally wanted to call it "libre software" but there wasn't an equivalent word in english so instead he went with "free software" and thus the confusion was born. The line in the sand the GPL draws is specifically for the purpose of preventing closed versions of open source software (which would be against the original authors wishes). There are of course more liberal licenses such as the MIT license which do allow you to do this.