> Can you point to where in the docs/ARM/wiki/whatever it says that?

Found it!

ftp://ftp.isc.org/isc/bind9/9.11.2b1/doc/arm/Bv9ARM.ch06.html


Response Policy Zone (RPZ) Rewriting

BIND 9 includes a limited mechanism to modify DNS responses for requests 
analogous to email anti-spam DNS blacklists. Responses can be changed to deny 
the existence of domains (NXDOMAIN), deny the existence of IP addresses for 
domains (NODATA), or contain other IP addresses or data.

Response policy zones are named in the response-policy option for the view or 
among the global options if there is no response-policy option for the view. 
Response policy zones are ordinary DNS zones containing RRsets that can be 
queried normally if allowed. It is usually best to restrict those queries with 
something like allow-query { localhost; };. 
Note that zones using masterfile-format map cannot be used as policy zones. 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

I paid attention to the "Response policy zones are ordinary DNS zones", thought 
that meant 'in all ways', and didn't read on apparently :-/

AC
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