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/usr/share/doc/tar-doc/copyright is in tar-doc 1.29-1.

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 tar info documentation was extracted from the latest pre-release tar 
source package made available at ftp://alpha.gnu.org/gnu/tar, and packaged
for Debian by Bdale Garbee <bdale@gag.com>

The GNU tar documentation is

   Copyright (C) 1992, 1994, 1995, 1996, 1997, 1999, 2000, 2001,
   2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.

   Permission is granted to copy, distribute and/or modify this document
   under the terms of the GNU Free Documentation License, Version 1.1 or
   any later version published by the Free Software Foundation; with no
   Invariant Sections, with the Front-Cover Texts being ``A GNU Manual,''
   and with the Back-Cover Texts as in (a) below.  A copy of the license
   is included in the section entitled "GNU Free Documentation License".

   (a) The FSF's Back-Cover Text is: ``You are free to copy and modify
   this GNU Manual.  Buying copies from GNU Press supports the FSF in
   developing GNU and promoting software freedom.''

The Debian packaging is

   Copyright (C) 2006, 2007 Bdale Garbee <bdale@gag.com>

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 2, or (at your option) any later
   version.

On Debian GNU/Linux systems, the complete text of the GNU General Public
License version 2 can be found in /usr/share/common-licenses/GPL-2.