Awesome, they have a very popular game.
Someone who beats it with a computer program should not be negotiating with them for the release of the software. Especially with the nontrivial risk of lawsuit by a multi-billion dollar company hanging over his head.
*Edit - Just to be clear, there was no specific C&D made here. But I would definitely consider legal action a real threat when crossing Blizzard given how many times Blizzard has used legal tactics in the past. In additional to the aforementioned bnetd (which is a more defensible case), there was the implementation of the World of Warcraft clone in the Starcraft II engine that was shut down by legal action. That dude was a kid.
If Blizzard wants you to not do it, they will take legal action.