mirror of https://git.tukaani.org/xz.git
95 lines
4.3 KiB
Plaintext
95 lines
4.3 KiB
Plaintext
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XZ Utils Licensing
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==================
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Different licenses apply to different files in this package. Here
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is a rough summary of which licenses apply to which parts of this
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package (but check the individual files to be sure!):
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- liblzma is under the BSD Zero Clause License (0BSD).
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- The command line tools xz, xzdec, lzmadec, and lzmainfo are
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under 0BSD except that, on systems that don't have a usable
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getopt_long, GNU getopt_long is compiled and linked in from the
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'lib' directory. The getopt_long code is under GNU LGPLv2.1+.
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- The scripts to grep, diff, and view compressed files have been
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adapted from GNU gzip. These scripts (xzgrep, xzdiff, xzless,
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and xzmore) are under GNU GPLv2+. The man pages of the scripts
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are under 0BSD; they aren't based on the man pages of GNU gzip.
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- Most of the XZ Utils specific documentation that is in
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plain text files (like README, INSTALL, PACKAGERS, NEWS,
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and ChangeLog) are under 0BSD unless stated otherwise in
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the file itself. The files xz-file-format.txt and
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lzma-file-format.xt are in the public domain but may
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be distributed under the terms of 0BSD too.
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- Doxygen-generated HTML version of the liblzma API documentation:
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While Doxygen is under the GNU GPLv2, the license information
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in Doxygen includes the following exception:
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Documents produced by doxygen are derivative works
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derived from the input used in their production;
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they are not affected by this license.
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Note: The JavaScript files (under the MIT license) have
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been removed from the Doxygen output.
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- Translated messages and man pages are under 0BSD except that
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some old translations are in the public domain.
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- Test files and test code in the 'tests' directory, and
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debugging utilities in the 'debug' directory are under
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the BSD Zero Clause License (0BSD).
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- The GNU Autotools based build system contains files that are
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under GNU GPLv2+, GNU GPLv3+, and a few permissive licenses.
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These files don't affect the licensing of the binaries being
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built.
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- The extra directory contain files that are under various
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free software licenses.
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For the files under the BSD Zero Clause License (0BSD), if
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a copyright notice is needed, the following is sufficient:
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Copyright (C) The XZ Utils authors and contributors
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If you copy significant amounts of 0BSD-licensed code from XZ Utils
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into your project, acknowledging this somewhere in your software is
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polite (especially if it is proprietary, non-free software), but
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it is not legally required by the license terms. Here is an example
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of a good notice to put into "about box" or into documentation:
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This software includes code from XZ Utils <https://tukaani.org/xz/>.
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The following license texts are included in the following files:
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- COPYING.0BSD: BSD Zero Clause License
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- COPYING.LGPLv2.1: GNU Lesser General Public License version 2.1
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- COPYING.GPLv2: GNU General Public License version 2
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- COPYING.GPLv3: GNU General Public License version 3
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A note about old XZ Utils releases:
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XZ Utils releases 5.4.6 and older and 5.5.1alpha have a
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significant amount of code put into the public domain and
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that obviously remains so. The switch from public domain to
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0BSD for newer releases was made in Febrary 2024 because
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public domain has (real or perceived) legal ambiguities in
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some jurisdictions.
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There is very little *practical* difference between public
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domain and 0BSD. The main difference likely is that one
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shouldn't claim that 0BSD-licensed code is in the public
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domain; 0BSD-licensed code is copyrighted but available under
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an extremely permissive license. Neither 0BSD nor public domain
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require retaining or reproducing author, copyright holder, or
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license notices when distributing the software. (Compare to,
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for example, BSD 2-Clause "Simplified" License which does have
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such requirements.)
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If you have questions, don't hesitate to ask for more information.
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The contact information is in the README file.
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