There are two licenses, one for the C library software, and one for
the GeoLite Country database.

SOFTWARE LICENSE

Copyright (C) 2015 MaxMind, Inc.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.

For a copy of the LGPL License, see the COPYING file.

DATA LICENSE (GeoLite Country and City Databases)

The GeoLite databases are distributed under the Creative Commons
Attribution-ShareAlike 3.0 Unported License. The attribution
requirement may be met by including the following in all advertising
and documentation mentioning features of or use of this database:

 This product includes GeoLite data created by MaxMind, available from
  <a href="http://www.maxmind.com">http://www.maxmind.com</a>.