Brew on Premises regulations/laws

I know it isn’t exactly “pro brewing” but I have been striking out finding out the laws/regulations/licensing pertaining to Brew on Premises operations. I did find a little bit on the TTB site…http://www.ttb.gov/beer/faqs.shtml#b1.  It didn’t mention any sort of licensing though, maybe it is exempt on a federal level?? I know in CA they are legal…there a handful currently operating. But again I can’t find any sort of regulation or licensing information pertaining to them.  Does anybody have any insight??