Google Search: “unencumbered source”
The Open Source vs Free Software squabble is a distraction: it really boils down to pragmatism vs principle. This is not to claim the pragmatists are unprincipled or that the adherents to principle lack pragmatism, but instead to refer to them by their focus.
I’d like to see a new term that encompasses both, if I thought it would serve to stop the squabbling. There are more similarities than differences, after all.