The contents of HammondWiki is released under the Open Content License (OPL).
A copy of the license is available 
here.
The Open Content License is very similar to the GPL in spirit, but it is written for any content, not just source code.
In plain English, the license relieves the author of any liability or implication of warranty, grants others permission to use the Content in whole or in part, and insures that the original author will be properly credited when Content is used. It also grants others permission to modify and redistribute the Content if they clearly mark what changes have been made, when they were made, and who made them. Finally, the license insures that if someone else bases a work on Open Content, that the resultant work will be made available as Open Content as well.
See http://opencontent.org/ for more information.
The content of this page is Copyright (C) 2000, 2001, 2002 Geoffrey T. Dairiki and
the other authors of the content, whoever they may be.
This is free information and you are welcome redistribute it
under certain conditions; see
http://www.dairiki.org/HammondWiki/opl.html for details.
Absolutely no warrantee is made as to the correctness of
the information on this page.