It's considered seriously naff to title yourself Dr. on the strength of an honorary doctorate, though — at the very least, you should add "honoris causa". (Even

It's considered seriously naff to title yourself Dr. on the strength of an honorary doctorate, though — at the very least, you should add "honoris causa". (Even with an earned doctorate you're supposed to avoid referring to yourself as Dr. Smith, in the same way that you shouldn't introduce yourself as Mr. or Mrs. Smith.) Not that I'd really grudge the title to RMS though, who's done more technical hard work and innovation than many people who are running around with earned PhDs.