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/usr/share/doc/re2c/copyright is in re2c 0.13.5-1.

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 Daniel Bungert <drb@debian.org> on
Sun, 16 Sep 2001 01:35:17 -0400.

It was downloaded from http://sourceforge.net/projects/re2c/

Upstream Authors: 

Originally written by Peter Bumbulis (peter@csg.uwaterloo.ca)
Previously maintained by Brian Young (bayoung@acm.org)
Currently maintained by:
  * Dan Nuffer <nuffer@users.sourceforge.net>
  * Marcus Boerger <helly@users.sourceforge.net>
  * Hartmut Kaiser <hkaiser@users.sourceforge.net>

Copyright:

re2c is distributed with no warranty whatever.  The code is certain to
contain errors.  Neither the author nor any contributor takes
responsibility for any consequences of its use.

re2c is in the public domain.  The data structures and algorithms used
in re2c are all either taken from documents available to the general
public or are inventions of the author.  Programs generated by re2c may
be distributed freely.  re2c itself may be distributed freely, in source
or binary, unchanged or modified.  Distributors may charge whatever fees
they can obtain for re2c.

If you do make use of re2c, or incorporate it into a larger project an
acknowledgement somewhere (documentation, research report, etc.) would
be appreciated.