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Using and Modifying This Guide
This guide is available in DocBook source form, and possibly in other
forms as well, at the Davenport archive. To quote from the permission notice
that appears on the DocBook DTD and on this guide: Permission to use, copy, modify and distribute the DocBook DTD and its accompanying documentation for any purpose and without fee is hereby granted in perpetutity, provided that the above copyright notice and this paragraph appear in all copies.
You may use this guide however you see fit—redistribute it, modify it to conform to your DocBook variant, and so on—but you must retain the original copyright notice and the permission paragraph, and you must retitle the guide if you modify it.