Syntext Serna Stylesheet for DocBook is based on Norman Walsh 
stylesheet for Docbook, that was coming with the following 
copyright notice:

Copyright
---------

Copyright (C) 1999, 2000, 2001, 2002 Norman Walsh

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the ``Software''), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or
sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

Except as contained in this notice, the names of individuals
credited with contribution to this software shall not be used in
advertising or otherwise to promote the sale, use or other
dealings in this Software without prior written authorization
from the individuals in question.

Any stylesheet derived from this Software that is publically
distributed will be identified with a different name and the
version strings in any derived Software will be changed so that
no possibility of confusion between the derived package and this
Software will exist.

Warranty
--------

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT.  IN NO EVENT SHALL NORMAN WALSH OR ANY OTHER
CONTRIBUTOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Contacting the Author
---------------------

These stylesheets are maintained by Norman Walsh, <ndw@nwalsh.com>.
