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/usr/share/doc/dvi2dvi/copyright is in dvi2dvi 2.0alpha-9.2.

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 Masayuki Hatta <mhatta@debian.org> on
Fri,  6 Jul 2001 16:44:37 +0900.

It was downloaded from ftp://ftp.math.s.chiba-u.ac.jp/tex/

Upstream Author: Takafumi Sakurai <sakurai@math.s.chiba-u.ac.jp>

Copyright:

The following is the English translation of dvi2dvi license(based on
dvi2ps license provided by the same upstream author):

All of the files included in this dvi2dvi release, with the exception
of files that include copyright notice in them, are covered by the
following copyright:

Copyright (c) 1989-2001 Takafumi Sakurai.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must include source code, or
   there must be a well-publicized means of obtaining the source
   code for no more than a reasonable reproduction cost.
3. The package name of the modified software must not be ``dvi2dvi''
   or ``dvi2dvi-<XX>'' where <XX> is the version number.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.

See also copyright.ja.