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+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0.  If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+Notes for BIND 9.16.16
+----------------------
+
+Feature Changes
+~~~~~~~~~~~~~~~
+
+- DNSSEC responses containing NSEC3 records with iteration counts
+  greater than 150 are now treated as insecure. :gl:`#2445`
+
+- The maximum supported number of NSEC3 iterations that can be
+  configured for a zone has been reduced to 150. :gl:`#2642`
+
+- The default value of the ``max-ixfr-ratio`` option was changed to
+  ``unlimited``, for better backwards compatibility in the stable
+  release series. :gl:`#2671`
+
+- Zones that want to transition from secure to insecure mode without
+  becoming bogus in the process must now have their ``dnssec-policy``
+  changed first to ``insecure``, rather than ``none``. After the DNSSEC
+  records have been removed from the zone, the ``dnssec-policy`` can be
+  set to ``none`` or removed from the configuration. Setting the
+  ``dnssec-policy`` to ``insecure`` causes CDS and CDNSKEY DELETE
+  records to be published. :gl:`#2645`
+
+- The implementation of the ZONEMD RR type has been updated to match
+  :rfc:`8976`. :gl:`#2658`
+
+- The ``draft-vandijk-dnsop-nsec-ttl`` IETF draft was implemented:
+  NSEC(3) TTL values are now set to the minimum of the SOA MINIMUM value
+  or the SOA TTL. :gl:`#2347`
+
+Bug Fixes
+~~~~~~~~~
+
+- It was possible for corrupt journal files generated by an earlier
+  version of ``named`` to cause problems after an upgrade. This has been
+  fixed. :gl:`#2670`
+
+- TTL values in cache dumps were reported incorrectly when
+  ``stale-cache-enable`` was set to ``yes``. This has been fixed.
+  :gl:`#389` :gl:`#2289`
+
+- A deadlock could occur when multiple ``rndc addzone``, ``rndc
+  delzone``, and/or ``rndc modzone`` commands were invoked
+  simultaneously for different zones. This has been fixed. :gl:`#2626`
+
+- ``named`` and ``named-checkconf`` did not report an error when
+  multiple zones with the ``dnssec-policy`` option set were using the
+  same zone file. This has been fixed. :gl:`#2603`
+
+- If ``dnssec-policy`` was active and a private key file was temporarily
+  offline during a rekey event, ``named`` could incorrectly introduce
+  replacement keys and break a signed zone. This has been fixed.
+  :gl:`#2596`
+
+- When generating zone signing keys, KASP now also checks for key ID
+  conflicts among newly created keys, rather than just between new and
+  existing ones. :gl:`#2628`
+
+Known Issues
+~~~~~~~~~~~~
+
+- There are no new known issues with this release. See :ref:`above
+  <relnotes_known_issues>` for a list of all known issues affecting this
+  BIND 9 branch.