> Knuth accused me quite harshly (IMO) to be some kind of Stallman fan talking n...

> Knuth accused me quite harshly (IMO) to be some kind of Stallman fan talking nonsense about licenses and did not acknowledge the bug.

Strange. Knuth appears to be a significant GNU supporter: http://www.gnu.org/thankgnus/2014supporters.html

I guess he had a bad day or whatever. Or maybe I read too much into what he wrote.