I'm one of the people that makes the sauce. We do indeed have all our employees sign a confidentiality agreement, and for some reason most of them take it pretty seriously. Only the managers and a few crewmembers know the exact recipe, but about 75% of the employees can at least tell you the ingredients.

You can make the sauce with common ingredients, and I've calculated out the exact recipe in a smaller size (we make it several gallons at a time), and I've made it at home and discovered its much much cheaper (about 60% cheaper) to just buy a 20 or 32 oz sauce than to make an equivalent amount myself.

As to why you can't find the recipe on the internet, I have a theory that someone over here regularly searches the internet and finds the recipe and gets it deleted. Or maybe nobody that actually knows the exact recipe has ever felt the need to post it.