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| XZ Utils Licensing | |
| ================== | |
| Different licenses apply to different files in this package. Here | |
| is a rough summary of which licenses apply to which parts of this | |
| package (but check the individual files to be sure!): | |
| - liblzma is in the public domain. | |
| - xz, xzdec, and lzmadec command line tools are in the public | |
| domain unless GNU getopt_long had to be compiled and linked | |
| in from the lib directory. The getopt_long code is under | |
| GNU LGPLv2.1+. | |
| - The scripts to grep, diff, and view compressed files have been | |
| adapted from gzip. These scripts and their documentation are | |
| under GNU GPLv2+. | |
| - All the documentation in the doc directory and most of the | |
| XZ Utils specific documentation files in other directories | |
| are in the public domain. | |
| Note: The JavaScript files (under the MIT license) have | |
| been removed from the Doxygen-generated HTML version of the | |
| liblzma API documentation. Doxygen itself is under the GNU GPL | |
| but the remaining files generated by Doxygen are not affected | |
| by the licenses used in Doxygen because Doxygen licensing has | |
| the following exception: | |
| "Documents produced by doxygen are derivative works | |
| derived from the input used in their production; | |
| they are not affected by this license." | |
| - Translated messages are in the public domain. | |
| - The build system contains public domain files, and files that | |
| are under GNU GPLv2+ or GNU GPLv3+. None of these files end up | |
| in the binaries being built. | |
| - Test files and test code in the tests directory, and debugging | |
| utilities in the debug directory are in the public domain. | |
| - The extra directory may contain public domain files, and files | |
| that are under various free software licenses. | |
| You can do whatever you want with the files that have been put into | |
| the public domain. If you find public domain legally problematic, | |
| take the previous sentence as a license grant. If you still find | |
| the lack of copyright legally problematic, you have too many | |
| lawyers. | |
| As usual, this software is provided "as is", without any warranty. | |
| If you copy significant amounts of public domain code from XZ Utils | |
| into your project, acknowledging this somewhere in your software is | |
| polite (especially if it is proprietary, non-free software), but | |
| naturally it is not legally required. Here is an example of a good | |
| notice to put into "about box" or into documentation: | |
| This software includes code from XZ Utils <https://tukaani.org/xz/>. | |
| The following license texts are included in the following files: | |
| - COPYING.LGPLv2.1: GNU Lesser General Public License version 2.1 | |
| - COPYING.GPLv2: GNU General Public License version 2 | |
| - COPYING.GPLv3: GNU General Public License version 3 | |
| Note that the toolchain (compiler, linker etc.) may add some code | |
| pieces that are copyrighted. Thus, it is possible that e.g. liblzma | |
| binary wouldn't actually be in the public domain in its entirety | |
| even though it contains no copyrighted code from the XZ Utils source | |
| package. | |
| If you have questions, don't hesitate to ask the author(s) for more | |
| information. | |