The libsquashfs
library is released under the terms and conditions of the
GNU Lesser General Public License version 3 or later. This applies to
all source code in the directories lib/sqfs
, lib/util
and include/sqfs
with the following exceptions:
lib/util/xxhash.c
contains a modified implementation of the xxhash32 algorithm. Seelicenses/xxhash.txt
for copyright and licensing information (2 clause BSD license).lib/lz4
contains files extracted from the LZ4 compression library. Seelib/lz4/README
for details andlicenses/LZ4.txt
for copyright and licensing information (2 clause BSD license).lib/zlib
contains files that have been extracted from the the zlib compression library and modified. Seelib/zlib/README
for details andlicenses/zlib.txt
for details.lib/util/hash_table.c
,include/hash_table.h
andlib/util/fast_urem_by_const.h
contain a hash table implementation (MIT license). Seelicenses/hash_table.txt
for details.
The rest of squashfs-tools-ng is released under the terms and conditions of the GNU General Public License version 3 or later.
Copies of the LGPLv3 and GPLv3 are included in licenses/LGPLv3.txt
and
licenses/GPLv3.txt
respectively.
The original source code of squashfs-tools-ng has been written by David Oberhollenzer in 2019 and onward. Additional contributions have been added since the initial release which makes some parts of the package subject to the copyright of the respective authors. Appropriate copyright notices and SPDX identifiers are included in the source code files.
Although the existing squashfs-tools and the Linux kernel implementation have been used for testing, the source code in this package is neither based on, nor derived from either of them.
The auto-tools based build system has in large parts been hacked together by copy & pasting from various tutorials and other projects (mostly util-linux, and mtd-utils), overhauled many times since 2015.
The m4 macros in the m4
directory were copied verbatim and have explicit
licenses. Please respect those. As for everything else, feel free to copy and
paste it as you wish.
The doc
directory contains measurement data, pseudo lab reports and an RFC
style write-up of the SquashFS format. You may do with those as you please.
If you use those as a basis for writing about SquashFS or this package, please cite your sources and mark verbatim quotations as such. I won't be angry if you don't, but a thesis supervisor, reviewer or fellow Wikipedian might be.
If this file is included in a binary release package, additional 3rd party libraries may be included, which are subject to the copyright of their respective authors and the terms and conditions of their respective licenses.
The following may be included:
- The LZO compression library. Copyright Markus F.X.J. Oberhumer. This is
released under the terms and conditions of the GNU General Public License
version 2. A copy of the license is included in
licenses/GPLv2.txt
. - The LZ4 compression library. Copyright Yann Collet. This is released under a
2 clause BSD style license, included in
licenses/LZ4.txt
. This library may be linked directly intolibsquashfs
, built from source code included in the source distribution. - The XZ utils liblzma library is released into the public domain. An excerpt
from the
COPYING
file of its source code archive is included inlicenses/xz.txt
. - The zlib compression library. Copyright Jean-loup Gailly and Mark Adler.
This is released under the terms and conditions of the zlib license,
included in
licenses/zlib.txt
. This library may be linked directly intolibsquashfs
, built from source code included in the source distribution. - The zstd compression library. Copyright Facebook, Inc. All rights reserved.
This is released under a BSD style license, included in
licenses/zstd.txt
.
Independent of build configurations, the libsquashfs
library contains
the following 3rd party source code, directly linked into the library:
- A modified version of the xxhash32 hash function (Copyright Yann Collet).
This is released under a 2-Clause BSD License. See
licenses/xxhash.txt
for details. - A hash table implementation liftet from the Mesa3D source code. This is
released under the MIT/X11 license. See
licenses/hash_table.txt
for details.