The program code is released under the following licence: GPL for personal use on a single computer.
All other users (including Commercial, Charity, Educational, Government)
must apply in writing for a licence for use from Nigel Horne at `<njh at nigelhorne.com>`.

Refer to the source URL for licencing information for these files
cities.csv is from https://www.maxmind.com/en/free-world-cities-database
admin1.db is from http://download.geonames.org/export/dump/admin1CodesASCII.txt
admin2.db is from http://download.geonames.org/export/dump/admin2Codes.txt

See also http://download.geonames.org/export/dump/allCountries.zip

To significantly speed this up, gunzip cities.csv and run it through the db2sql script to create an SQLite file.