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
-annoncement clause that collides with GPL.
+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!
+ possible.
OpenSSL http://www.openssl.org/source/license.html
(May be used for SSL/TLS support) Uses an Original BSD-style license
- with an announement clause that makes it "incompatible" with GPL. You
+ 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 instead.
+ licensing is a problem for you, consider using GnuTLS or yassl
+ instead.
GnuTLS http://www.gnutls.org/
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
(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 Original BSD-licensed with the announcement clause. Some
- of the code in libcurl that is written to deal with Kerberos4 likewise
- have such a license.
-
MIT Kerberos http://web.mit.edu/kerberos/www/dist/
(May be used for GSS support) MIT licensed, that shouldn't collide
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://www.gnu.org/licenses/lgpl.html
+libidn http://josefsson.org/libidn/
(Used for IDNA support) Uses the GNU Lesser General Public
- License. LGPL is a variation of GPL with slightly less aggressive
+ 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
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/