He meant free (as in freedom), not open. "Proof" of that is in the submission's article. It's not exactly a formal proof but it has convinced most people here.

He meant free (as in freedom), not open. "Proof" of that is in the submission's article. It's not exactly a formal proof but it has convinced most people here. Unfortunately, this highlights some weaknesses in the GPLv2, which is supposed to guarantee freedom.