But Andre, he is doing what he is paid to do - to defend what he has created.

Sorry, this discussion has nothing to do what "what I'm paid to do" and I had no role whatsoever in the development of RPZ (I left ISC long before Paul and Vernon hacked BIND to support it). I don't even like it all that much. However, given RPZ solves a particular need and that multiple vendors are implementing it, I'd prefer they do so in an interoperable way rather than everybody doing their own thing in incompatible ways. I would have hoped we (folks who develop Internet technologies) learned our lesson from NAT (hey, isn't that "lying"?).