This file is indexed.

/usr/share/doc/docbook/copyright is in docbook 4.5-5.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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This package was debianized by Mark Eichin <eichin@thok.org> on Mon,
30 Jun 1997 14:11:38 -0400.  It is currently maintained by Adam Di
Carlo <aph@debian.org> and the Debian XML/SGML group
<debian-xml-sgml-devel@lists.alioth.debian.org>.  No changes were made
to the upstream version of these materials, although the provided SGML
Open catalogs were trimmed or enhanced to suit Debian's SGML
infrastructure.  All Debian integration scripts and packages are under
the GPL v2 or later, a copy of which can be found on Debian systems
in '/usr/share/common-licenses/GPL-2'.

Download:

  The original upstream materials may be downloaded from
  <URL:http://www.oasis-open.org/docbook/sgml/>. This process is
  transparent via the `get-orig-source' target in debian/rules.

Copyright:

  Copyright 1992-2006 HaL Computer Systems, Inc.,
  O'Reilly & Associates, Inc., ArborText, Inc., Fujitsu Software
  Corporation, orman Walsh, un Microsystems, Inc.,  and the
  Organization for the Advancement of Structured Information
  Standards (OASIS).

License and Warranty:

  Permission to use, copy, modify and distribute the DocBook DTD and
  its accompanying documentation for any purpose and without fee is
  hereby granted in perpetuity, provided that the above copyright
  notice and this paragraph appear in all copies.  The copyright
  holders make no representation about the suitability of the DTD for
  any purpose.  It is provided "as is" without expressed or implied
  warranty.

  If you modify the DocBook DTD in any way, except for declaring and
  referencing additional sets of general entities and declaring
  additional notations, label your DTD as a variant of DocBook.  See
  the maintenance documentation for more information.