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Diffstat (limited to 'plugins/FTPFileYM/curl/docs/LICENSE-MIXING')
| -rw-r--r-- | plugins/FTPFileYM/curl/docs/LICENSE-MIXING | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/plugins/FTPFileYM/curl/docs/LICENSE-MIXING b/plugins/FTPFileYM/curl/docs/LICENSE-MIXING new file mode 100644 index 0000000000..f596546da5 --- /dev/null +++ b/plugins/FTPFileYM/curl/docs/LICENSE-MIXING @@ -0,0 +1,130 @@ + License Mixing with apps, libcurl and Third Party Libraries + =========================================================== + +libcurl can be built to use a fair amount of various third party libraries, +libraries that are written and provided by other parties that are distributed +using their own licenses. Even libcurl itself contains code that may cause +problems to some. This document attempts to describe what licenses libcurl and +the other libraries use and what possible dilemmas linking and mixing them all +can lead to for end users. + +I am not a lawyer and this is not legal advice! + +One common dilemma is that GPL[1]-licensed code is not allowed to be linked +with code licensed under the Original BSD license (with the announcement +clause). You may still build your own copies that use them all, but +distributing them as binaries would be to violate the GPL license - unless you +accompany your license with an exception[2]. This particular problem was +addressed when the Modified BSD license was created, which does not have the +announcement clause that collides with GPL. + +libcurl http://curl.haxx.se/docs/copyright.html + + Uses an MIT (or Modified BSD)-style license that is as liberal as + possible. Some of the source files that deal with KRB4 have Original + BSD-style announce-clause licenses. You may not distribute binaries + with krb4-enabled libcurl that also link with GPL-licensed code! + +OpenSSL http://www.openssl.org/source/license.html + + (May be used for SSL/TLS support) Uses an Original BSD-style license + with an announcement clause that makes it "incompatible" with GPL. You + are not allowed to ship binaries that link with OpenSSL that includes + GPL code (unless that specific GPL code includes an exception for + OpenSSL - a habit that is growing more and more common). If OpenSSL's + licensing is a problem for you, consider using GnuTLS or yassl + instead. + +GnuTLS http://www.gnutls.org/ + + (May be used for SSL/TLS support) Uses the LGPL[3] license. If this is + a problem for you, consider using OpenSSL instead. Also note that + GnuTLS itself depends on and uses other libs (libgcrypt and + libgpg-error) and they too are LGPL- or GPL-licensed. + +yassl http://www.yassl.com/ + + (May be used for SSL/TLS support) Uses the GPL[1] license. If this is + a problem for you, consider using OpenSSL or GnuTLS instead. + +NSS http://www.mozilla.org/projects/security/pki/nss/ + + (May be used for SSL/TLS support) Is covered by the MPL[4] license, + the GPL[1] license and the LGPL[3] license. You may choose to license + the code under MPL terms, GPL terms, or LGPL terms. These licenses + grant you different permissions and impose different obligations. You + should select the license that best meets your needs. + +axTLS http://axtls.sourceforge.net/ + + (May be used for SSL/TLS support) Uses a Modified BSD-style license. + +c-ares http://daniel.haxx.se/projects/c-ares/license.html + + (Used for asynchronous name resolves) Uses an MIT license that is very + liberal and imposes no restrictions on any other library or part you + may link with. + +zlib http://www.gzip.org/zlib/zlib_license.html + + (Used for compressed Transfer-Encoding support) Uses an MIT-style + license that shouldn't collide with any other library. + +krb4 + + While nothing in particular says that a Kerberos4 library must use any + particular license, the one I've tried and used successfully so far + (kth-krb4) is partly Original BSD-licensed with the announcement + clause. Some of the code in libcurl that is written to deal with + Kerberos4 is Modified BSD-licensed. + +MIT Kerberos http://web.mit.edu/kerberos/www/dist/ + + (May be used for GSS support) MIT licensed, that shouldn't collide + with any other parts. + +Heimdal http://www.pdc.kth.se/heimdal/ + + (May be used for GSS support) Heimdal is Original BSD licensed with + the announcement clause. + +GNU GSS http://www.gnu.org/software/gss/ + + (May be used for GSS support) GNU GSS is GPL licensed. Note that you + may not distribute binary curl packages that uses this if you build + curl to also link and use any Original BSD licensed libraries! + +fbopenssl + + (Used for SPNEGO support) Unclear license. Based on its name, I assume + that it uses the OpenSSL license and thus shares the same issues as + described for OpenSSL above. + +libidn http://josefsson.org/libidn/ + + (Used for IDNA support) Uses the GNU Lesser General Public + License [3]. LGPL is a variation of GPL with slightly less aggressive + "copyleft". This license requires more requirements to be met when + distributing binaries, see the license for details. Also note that if + you distribute a binary that includes this library, you must also + include the full LGPL license text. Please properly point out what + parts of the distributed package that the license addresses. + +OpenLDAP http://www.openldap.org/software/release/license.html + + (Used for LDAP support) Uses a Modified BSD-style license. Since + libcurl uses OpenLDAP as a shared library only, I have not heard of + anyone that ships OpenLDAP linked with libcurl in an app. + +libssh2 http://www.libssh2.org/ + + (Used for scp and sftp support) libssh2 uses a Modified BSD-style + license. + +[1] = GPL - GNU General Public License: http://www.gnu.org/licenses/gpl.html +[2] = http://www.fsf.org/licenses/gpl-faq.html#GPLIncompatibleLibs details on + how to write such an exception to the GPL +[3] = LGPL - GNU Lesser General Public License: + http://www.gnu.org/licenses/lgpl.html +[4] = MPL - Mozilla Public License: + http://www.mozilla.org/MPL/ |