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/usr/share/doc/zlibc/copyright is in zlibc 0.9k-4.3.

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This package was debianized by Luca Filipozzi lfilipoz@emyr.net on 
Mon,  4 Jun 2001 21:24:05 -0700. It is currently maintained by
Francesco P. Lovergine <frankie@debian.org>

It was downloaded from http://zlibc.linux.lu/

Copyright: Copyright (C) 1993-1999 Alain Knaff.

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 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software 
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.

[ The full text of the GNU General Public License can be found on Debian
machines in the /usr/share/common-licenses/GPL file. ]