Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/LICENSE-MIXING.md @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
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1 License Mixing
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2 ==============
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4 libcurl can be built to use a fair amount of various third party libraries,
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5 libraries that are written and provided by other parties that are distributed
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6 using their own licenses. Even libcurl itself contains code that may cause
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7 problems to some. This document attempts to describe what licenses libcurl and
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8 the other libraries use and what possible dilemmas linking and mixing them all
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9 can lead to for end users.
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11 I am not a lawyer and this is not legal advice!
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13 One common dilemma is that [GPL](https://www.gnu.org/licenses/gpl.html)
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14 licensed code is not allowed to be linked with code licensed under the
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15 [Original BSD license](https://spdx.org/licenses/BSD-4-Clause.html) (with the
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16 announcement clause). You may still build your own copies that use them all,
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17 but distributing them as binaries would be to violate the GPL license - unless
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18 you accompany your license with an
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19 [exception](https://www.gnu.org/licenses/gpl-faq.html#GPLIncompatibleLibs). This
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20 particular problem was addressed when the [Modified BSD
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21 license](https://opensource.org/licenses/BSD-3-Clause) was created, which does
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22 not have the announcement clause that collides with GPL.
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24 ## libcurl
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26 Uses an [MIT style license](https://curl.haxx.se/docs/copyright.html) that is
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27 very liberal.
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29 ## OpenSSL
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31 (May be used for SSL/TLS support) Uses an Original BSD-style license with an
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32 announcement clause that makes it "incompatible" with GPL. You are not
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33 allowed to ship binaries that link with OpenSSL that includes GPL code
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34 (unless that specific GPL code includes an exception for OpenSSL - a habit
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35 that is growing more and more common). If OpenSSL's licensing is a problem
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36 for you, consider using another TLS library.
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38 ## GnuTLS
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40 (May be used for SSL/TLS support) Uses the
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41 [LGPL](https://www.gnu.org/licenses/lgpl.html) license. If this is a problem
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42 for you, consider using another TLS library. Also note that GnuTLS itself
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43 depends on and uses other libs (libgcrypt and libgpg-error) and they too are
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44 LGPL- or GPL-licensed.
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46 ## WolfSSL
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48 (May be used for SSL/TLS support) Uses the GPL license or a proprietary
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49 license. If this is a problem for you, consider using another TLS library.
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51 ## NSS
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53 (May be used for SSL/TLS support) Is covered by the
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54 [MPL](https://www.mozilla.org/MPL/) license, the GPL license and the LGPL
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55 license. You may choose to license the code under MPL terms, GPL terms, or
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56 LGPL terms. These licenses grant you different permissions and impose
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57 different obligations. You should select the license that best meets your
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58 needs.
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59
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60 ## mbedTLS
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61
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62 (May be used for SSL/TLS support) Uses the [Apache 2.0
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63 license](https://opensource.org/licenses/Apache-2.0) or the GPL license.
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64 You may choose to license the code under Apache 2.0 terms or GPL terms.
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65 These licenses grant you different permissions and impose different
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66 obligations. You should select the license that best meets your needs.
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68 ## BoringSSL
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69
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70 (May be used for SSL/TLS support) As an OpenSSL fork, it has the same
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71 license as that.
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73 ## libressl
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74
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75 (May be used for SSL/TLS support) As an OpenSSL fork, it has the same
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76 license as that.
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78 ## c-ares
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79
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80 (Used for asynchronous name resolves) Uses an MIT license that is very
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81 liberal and imposes no restrictions on any other library or part you may link
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82 with.
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84 ## zlib
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86 (Used for compressed Transfer-Encoding support) Uses an MIT-style license
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87 that shouldn't collide with any other library.
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89 ## MIT Kerberos
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91 (May be used for GSS support) MIT licensed, that shouldn't collide with any
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92 other parts.
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94 ## Heimdal
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95
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96 (May be used for GSS support) Heimdal is Original BSD licensed with the
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97 announcement clause.
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99 ## GNU GSS
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100
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101 (May be used for GSS support) GNU GSS is GPL licensed. Note that you may not
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102 distribute binary curl packages that uses this if you build curl to also link
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103 and use any Original BSD licensed libraries!
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104
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105 ## libidn
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106
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107 (Used for IDNA support) Uses the GNU Lesser General Public License [3]. LGPL
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108 is a variation of GPL with slightly less aggressive "copyleft". This license
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109 requires more requirements to be met when distributing binaries, see the
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110 license for details. Also note that if you distribute a binary that includes
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111 this library, you must also include the full LGPL license text. Please
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112 properly point out what parts of the distributed package that the license
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113 addresses.
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114
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115 ## OpenLDAP
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116
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117 (Used for LDAP support) Uses a Modified BSD-style license. Since libcurl uses
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118 OpenLDAP as a shared library only, I have not heard of anyone that ships
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119 OpenLDAP linked with libcurl in an app.
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120
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121 ## libssh2
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122
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123 (Used for scp and sftp support) libssh2 uses a Modified BSD-style license.