The following license applies to the wordlist (for model testmain.word) included in testapp/testmain/fixtures/initial_data.json.

Src: http://dreamsteep.com/projects/the-english-open-word-list.html
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UK Advanced Cryptics Dictionary Licensing Information:

Copyright © J Ross Beresford 1993-1999. All Rights Reserved.

The following restriction is placed on the use of this publication: if the UK Advanced Cryptics Dictionary is used in a software package or redistributed in any form, the copyright notice must be prominently displayed and the text of this document must be included verbatim.

There are no other restrictions: I would like to see the list distributed as widely as possible.