Category : OS/2 Files
Archive   : UNZ50X16.ZIP
Filename : COPYING

===============================================================================
The following copyrights are claimed on portions of the UnZip source code.
Further comments are at the bottom.
===============================================================================

Copyright in unzip.c, originally from unzip version 1.2 (?):

* Copyright 1989 Samuel H. Smith; All rights reserved
*
* Do not distribute modified versions without my permission.
* Do not remove or alter this notice or any other copyright notice.
* If you use this in your own program you must distribute source code.
* Do not use any of this in a commercial product.

-------------------------------------------------------------------------------

Copyright in misc.c, applying to UpdateCRC() and crc_32_tab[]:

COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or code
or tables extracted from it, as desired without restriction.

-------------------------------------------------------------------------------

Copyright in vms.c, distributed with UnZip versions 4.2 and later:

* Copyright (C) 1992 Igor Mandrichenko.
* Permission is granted to any individual or institution to use, copy,
* or redistribute this software so long as all of the original files
* are included unmodified, that it is not sold for profit, and that
* this copyright notice is retained.

-------------------------------------------------------------------------------

Additional copyright information:

BILF (distributed with the VMS stuff) is copyrighted by Rahul Dhesi,
but it is freely distributable.

The functions extract_or_test_files() and store_info() in extract.c,
do_string() and return_VMS() in misc.c, VMS version of echo() in
file_io.c, and find_end_central_dir() in unzip.c, were written by
Greg Roelofs and subsequently modified by many others via Info-ZIP.
I do not claim a copyright on these routines, but I do ask that no
one else do so either, 🙂 and that anyone using them in other pro-
grams note their source.

The function decrypt_member() in extract.c and the password functions
in file_io.c were written by Mark Adler, as were the inflate.c and
explode.c modules.

The function mapped_name() in mapname.c was written by David Kirschbaum,
based on the XXU program by Frank Da Cruz.

The module match.c was written by J. Kercheval and modified by David
Kirschbaum for use in UnZip.

Original notes from unzip 2.0a by Carl Mascott, [email protected]
(these are only the modifications which seem still to exist):
* 12/14/89 C. Mascott 2.0a adapt for UNIX
* don't pre-allocate output file space
* implement -t, -v, member file specs
* buffer all input
* fix "Bad CRC" msg: good/bad CRCs were swapped
* check for write error on output file

Most of the remaining routines have contributions from all of us, and
show it. 🙂

===============================================================================

Info-ZIP comments:

Info-ZIP has very little interest in legal matters, aside from the usual
"CYA" sense (that's an acronym, and you can figure it out yourself 🙂 ).

As far as we are aware--and please note that the numerous contributors
and copyright holders make this a little uncertain--the UnZip code is now
"clean" in the sense that an UnZip executable may be distributed with a
commercial product SO LONG AS IT IS CLEAR THAT UNZIP IS NOT BEING SOLD,
THAT THE SOURCE CODE IS FREELY AVAILABLE, AND THAT THERE ARE NO EXTRA OR
HIDDEN CHARGES RESULTING FROM ITS USE BY OR INCLUSION WITH THE COMMERCIAL
PRODUCT. In particular, the retroactive copyright on unimplode.c which
Carl Mascott requested we include in UnZip 4.2 is no longer in force, since
Mark Adler has rewritten the module in question from scratch (it's about
twice as fast, too! 🙂 ).

Regarding the original copyright by Mr. Smith: Info-ZIP has finally found
him again (he's moved to southern California), and he's apparently happy
with the current code and restrictions. More specifically, since the
current incarnation of UnZip can be considered "our own"--it bears very
little resemblance to his original program, in either content or size 🙂
--and since we freely distribute the source code, we believe that we are
within the bounds of his third stipulation.

Info-ZIP continues to rewrite portions of the code as time permits, in an
effort to eliminate as many of the restrictions (and bugs) as possible.
The bugs are our primary concern, however, so don't hold your breath. 🙂

===============================================================================