Certifying body for Permaculture Design Courses

I was just wondering if there is some sort of international or national regulatory body that oversees permaculture education.

Who decides what gets taught in a PDC or who gets to teach it, or how it is taught, and who can issue certificates?

I know that there are some general guidelines as far as curriculum and length of training that have carried over from when Mollison first instituted the PDC, but is there anything formal now?

huge can of worms.  You will hear a lot of different answers.  There is a move towards those holding a diploma in Permaculture or even Permaculture education are those allowed to teach and give out certificates.  I stick to the 14 chapters of the designers manual, blend a bit of new stuff in, and do an exhaustive design project.