Well, threatened with legal action and wasn't up for fighting it. It didn't get as far as him being sued, and while I can't blame him in the slightest for that

Well, threatened with legal action and wasn't up for fighting it. It didn't get as far as him being sued, and while I can't blame him in the slightest for that choice, I would have been absolutely fascinated if it did go to court. A compatible reimplementation of something that's being sold to emergency services being slapped down because it's compatible sounds like the sort of thing useful precedent could have come out of.