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1
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2 XZ Utils Licensing
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3 ==================
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4
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5 Different licenses apply to different files in this package. Here
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6 is a summary of which licenses apply to which parts of this package:
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7
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8 - liblzma is under the BSD Zero Clause License (0BSD).
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9
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10 - The command line tools xz, xzdec, lzmadec, and lzmainfo are
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11 under 0BSD except that, on systems that don't have a usable
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12 getopt_long, GNU getopt_long is compiled and linked in from the
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13 'lib' directory. The getopt_long code is under GNU LGPLv2.1+.
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14
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15 - The scripts to grep, diff, and view compressed files have been
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16 adapted from GNU gzip. These scripts (xzgrep, xzdiff, xzless,
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17 and xzmore) are under GNU GPLv2+. The man pages of the scripts
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18 are under 0BSD; they aren't based on the man pages of GNU gzip.
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19
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20 - Most of the XZ Utils specific documentation that is in
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21 plain text files (like README, INSTALL, PACKAGERS, NEWS,
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22 and ChangeLog) are under 0BSD unless stated otherwise in
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23 the file itself. The files xz-file-format.txt and
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24 lzma-file-format.xt are in the public domain but may
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25 be distributed under the terms of 0BSD too.
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26
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27 - Translated messages and man pages are under 0BSD except that
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28 some old translations are in the public domain.
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29
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30 - Test files and test code in the 'tests' directory, and
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31 debugging utilities in the 'debug' directory are under
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32 the BSD Zero Clause License (0BSD).
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33
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34 - The GNU Autotools based build system contains files that are
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35 under GNU GPLv2+, GNU GPLv3+, and a few permissive licenses.
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36 These files don't affect the licensing of the binaries being
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37 built.
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38
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39 - The 'extra' directory contains files that are under various
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40 free software licenses. These aren't built or installed as
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41 part of XZ Utils.
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42
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43 For the files under the BSD Zero Clause License (0BSD), if
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44 a copyright notice is needed, the following is sufficient:
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45
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46 Copyright (C) The XZ Utils authors and contributors
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47
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48 If you copy significant amounts of 0BSD-licensed code from XZ Utils
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49 into your project, acknowledging this somewhere in your software is
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50 polite (especially if it is proprietary, non-free software), but
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51 it is not legally required by the license terms. Here is an example
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52 of a good notice to put into "about box" or into documentation:
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53
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54 This software includes code from XZ Utils <https://tukaani.org/xz/>.
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55
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56 The following license texts are included in the following files:
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57 - COPYING.0BSD: BSD Zero Clause License
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58 - COPYING.LGPLv2.1: GNU Lesser General Public License version 2.1
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59 - COPYING.GPLv2: GNU General Public License version 2
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60 - COPYING.GPLv3: GNU General Public License version 3
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61
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62 A note about old XZ Utils releases:
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63
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64 XZ Utils releases 5.4.6 and older and 5.5.1alpha have a
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65 significant amount of code put into the public domain and
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66 that obviously remains so. The switch from public domain to
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67 0BSD for newer releases was made in Febrary 2024 because
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68 public domain has (real or perceived) legal ambiguities in
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69 some jurisdictions.
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70
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71 There is very little *practical* difference between public
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72 domain and 0BSD. The main difference likely is that one
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73 shouldn't claim that 0BSD-licensed code is in the public
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74 domain; 0BSD-licensed code is copyrighted but available under
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75 an extremely permissive license. Neither 0BSD nor public domain
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76 require retaining or reproducing author, copyright holder, or
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77 license notices when distributing the software. (Compare to,
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78 for example, BSD 2-Clause "Simplified" License which does have
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79 such requirements.)
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80
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81 If you have questions, don't hesitate to ask for more information.
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82 The contact information is in the README file.
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83
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