I'm sure that's proprietary too!
Sometimes I wonder if it's the actual production facility & not the PFC that wants this info kept from the public.
I do remember an incident during the recalls when Therese was putting together her wonderful list of PFCs & where they're made. One of the facilities that makes the food, not the PFC itself, contacted her & raised hell that they were listed on her website as the maker of a certain food........demanded she pull it off her website. I guess my assumption was that it was the PFC that wanted this info to remain a deep, dark secret. Perhaps there's an agreement that the PFC is not to disclose that info. I just don't understand why this should be such a big secret.