For current English (version >> 2.00) version:

This package was prepared by Osamu Aoki <osamu@debian.org> on
Sat, 31 May 2008 23:47:41 +0900 .

It will be published in DDP subversion but currently in local git 
repository.

Copyright © 2007-2009 Osamu Aoki

This book is free; you may redistribute it and/or modify it under the terms of
the GNU General Public License of any version compliant to the Debian Free
Software Guidelines (DFSG).

Copyright:
  This document may used under the terms the GNU General Public License
  version 2 or higher.

  Permission is granted to make and distribute verbatim copies of
  this document provided the copyright notice and this permission notice
  are preserved on all copies.

  Permission is granted to copy and distribute modified versions of
  this document under the conditions for verbatim copying, provided that
  the entire resulting derived work is distributed under the terms of
  a permission notice identical to this one.

  Permission is granted to copy and distribute translations of this
  document into another language, under the above conditions for
  modified versions, except that this permission notice may be included
  in translations approved by the Free Software Foundation instead of
  in the original English.

  [See /usr/share/common-licenses/GPL-2 for text of GPL v2]

I have asked all contributors including translators to license their work
under the same copyright as I did (GPL)