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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-02-16 02:25:04 +0100
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-02-16 02:25:04 +0100
commitcb9e7c71b5988a3bc9e42b82c214d32e7126db18 (patch)
treea904ffde351afffe690efdecf45960963b718a5f /COPYING.md
parent05eab84c84394faa96633cfa86fa5a42c1810e2b (diff)
Update the licensing documentation.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'COPYING.md')
-rw-r--r--COPYING.md38
1 files changed, 35 insertions, 3 deletions
diff --git a/COPYING.md b/COPYING.md
index 8d18b6d..4174ac9 100644
--- a/COPYING.md
+++ b/COPYING.md
@@ -2,7 +2,8 @@
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` and `include/sqfs`.
+all source code in the directories `lib/sqfs` and `include/sqfs`, unless
+otherwise noted.
The rest of squashfs-tools-ng is released under the terms and conditions of
the **GNU General Public License version 3 or later**.
@@ -20,6 +21,25 @@ 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.
+## Third Party Library Source Code
+
+The source code of `libsquashfs` incorporates modified copies of third party
+libraries that are subject to the terms and conditions of their respective
+licenses.
+
+The following is included:
+
+ - `lib/sqfs/block_processor/xxhash.c` contains a modified implementation of
+ the xxhash32 algorithm. See `licenses/xxhash.txt` for information on
+ copyright and licensing terms and conditions.
+ - `lib/sqfs/comp/lz4` contains files extracted from the LZ4 compression
+ library. See `lib/sqfs/comp/lz4/README` for details and `licenses/LZ4.txt`
+ for information on copyright and licensing terms and conditions.
+ - `lib/sqfs/comp/zlib` contains files that have been extracted from the the
+ zlib compression library and modified. See `lib/sqfs/comp/zlib/README` for
+ details and `licenses/zlib.txt` for information on copyright and licensing
+ terms and conditions.
+
# Binary Packages with 3rd Party Libraries
If this file is included in a binary release package, additional 3rd party
@@ -32,12 +52,24 @@ The following may be included:
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`.
+ 2 clause BSD style license, included in `licenses/LZ4.txt`. This library may
+ be linked directly into `libsquashfs`, 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
in `licenses/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`
+ included in `licenses/zlib.txt`. This library may be linked directly
+ into `libsquashfs`, 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`.
+
+
+Independend 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.