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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.
+
+##### Test MMDB databases
+
+This directory contains test versions of the GeoIP2/GeoLite2 CIty,
+Country, Domain, ISP, and ASN databases. The `.mmdb` files are built
+from the corresponding `.json` source files; to regenerate them, modify
+the source files and run `perl write-test-data.pl`.
+
+This script is adapted from one in
+[https://github.com/maxmind/MaxMind-DB](https://github.com/maxmind/MaxMind-DB).
+It depends on the MaxMind:DB:Writer module, which can be found in
+CPAN or at
+[https://github.com/maxmind/MaxMind-DB-Writer-perl](https://github.com/maxmind/MaxMind-DB-Writer-perl) .