Kiriwrite uses a regular expression for checking if UTF8 data that is 
passed to it is valid is from the World Wide Web Consortium (W3C) 
website. ( http://www.w3.org )

The W3C Software License (the 31st December 2002 version) 
is compatable with the GNU General Public License which Kiriwrite is 
licensed under.

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UTF8 validation check regular expression: 
http://www.w3.org/International/questions/qa-forms-utf-8

Copyright ©2003 World Wide Web Consortium, 
(Massachusetts Institute of Technology, European Research Consortium for 
Informatics and Mathematics, Keio University). All Rights Reserved. This 
work is distributed under the W3C® Software License [1] in thehope 
that it will be useful, but WITHOUT ANY WARRANTY; without even the 
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 

[1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231