openwebrtc Dependencies and Licenses

本文列举了在openwebrtc 构建  framework 过程中 依赖的三方库，  以及这些  三方库的licenses。

There are many projects required by OpenWebRTC to provide different parts of the functionality needed for WebRTC. This page is meant to help summaries the dependencies that are used by the project as well as their software licenses. For specific licenses, you need to find each project's license text - see here for an outdated list.

This page is not intended to be an introduction to how to work with Open Source software, rather a helping hand once you know that.

Also, the authors of this page are not lawyers. As when using any software in your own application, it is your responsibility to adhere to the licenses of that software.

Overview

OpenWebRTC has a mix of licenses amongst its dependencies - BSD, LGPL, MIT, etc. Each license has its own requirements, normally the copyright and license needs to be presented in any application written using the software. Some licenses have more significant requirements.

OpenSSL

OpenWebRTC uses OpenSSL for various encryption/decryption tasks. The OpenSSL licenses are said to be incompatible with GPL. You therefore cannot use OpenSSL as part of a GPL application and must modify the various dependencies of OpenWebRTC to use other cryptography libraries, such as gnutls if you wish to write a GPL application. This does not impact applications whose own license is not GPL.

LGPL v2 / v2.1

When packaged together, the requirements of all licenses must be met. However, BSD, MIT and similar licenses tend to only require that you present the copyright and license text in your application. LGPL v2 / v2.1 and later have stronger requirements. You must adhere to these requirements if you wish to use OpenWebRTC in an application.

It is recommended that you read the LGPL license texts:

• LGPL v2
• LGPL v2.1

To our non-lawyer eyes, an application using OpenWebRTC needs to adhere to at least one of the points in Section 6. As our attempt to help, when making releases, we also publish source code tarballs that include the cerbero build system as well as all the source code that gets downloaded when building for that target. This then contains all of the source code that is actually built by cerbero to make the OpenWebRTC binary releases.

Build System

Project	License
cerbero	LGPLv2.1

Build Tools

Project	License
android-sdk	Apache 2.0 (/GPLv2 for some code portions)
autoconf	GPLv3+
automake	GPLv2+
bison	GPLv3+
bzip2	BSD
flex	BSD
gas-preprocessor	GPLv2
gettext	GPLv3
gnome-common	GPLv2
gperf	GPLv2
gtk-doc-lite	GPLv2+ / GPLv3
intltool	GPLv2
libtool	GPLv2
m4	GPLv2
ndk	Apache 2.0 (/GPLv2 for some code portions)
pkg-config	GPLv2
sed
tar	GPLv3
xz	GPLv3
yasm	GPLv3

Dependencies

Project	License
bionic-fixup	Apache 2.0
glib	LGPLv2+
gnustl	LGPLv2.1
gobject-introspection	GPLv2 tools / LGPLv2.1 library
gst-plugins-bad-1.0	Mixed, depends on the plugin
gst-plugins-base-1.0	LGPLv2.1+
gst-plugins-good-1.0	LGPLv2.1+
gstreamer-1.0	LGPLv2.1+
icu	ICU License: http://source.icu-project.org/repos/icu/icu/trunk/license.html
javascriptcoregtk	LGPLv2.1/BSD
json-glib	LGPLv2.1+
libffi	BSD
libiconv	GPLv3+ tools / LGPLv2+ library
libnice	LGPLv2.1+ and MPL 1.1
libsoup	LGPLv2
libsrtp	BSD
libusrsctp	BSD
libvpx	BSD
libxml2	MIT
openh264	BSD
openssl	BSD-style but incompatible with GPL https://github.com/openssl/openssl/blob/master/LICENSE
opus	BSD
orc	BSD
seed	LGPLv2+
zlib	BSD

GStreamer Plugins

Project	Plugin	License
gst-plugins-bad	videoparsersbad	LGPLv2.1+
gst-plugins-good	alaw	LGPLv2.1+
gst-plugins-good	mulaw	LGPLv2.1+
gst-plugins-base	app	LGPLv2.1+
gstreamer	coreelements	LGPLv2.1+
gst-plugins-bad	inter	LGPLv2.1+
gst-plugins-base	videorate	LGPLv2.1+
openwebrtc-gst-plugins	androidvideosource	BSD 2-clause
gst-plugins-bad	applemedia	LGPLv2.1+
gst-plugins-bad	opensles	LGPLv2+
gst-plugins-good	osxaudio	LGPLv2.1+
gst-plugins-good	video4linux2	LGPLv2.1+
gst-plugins-base	audioconvert	LGPLv2.1+
gst-plugins-base	audioresample	LGPLv2.1+
openwebrtc-gst-plugins	ercolorspace	BSD 2-clause
gst-plugins-base	videoconvert	LGPLv2.1+
gst-plugins-good	videocrop	LGPLv2.1+
gst-plugins-good	videofilter	LGPLv2.1+
gst-plugins-base	videoscale	LGPLv2.1+
gst-plugins-base	volume	LGPLv2.1+
gst-plugins-good	rtp	LGPLv2.1+
gst-plugins-good	rtpmanager	LGPLv2.1+
gst-plugins-base	audiotestsrc	LGPLv2.1+
gst-plugins-base	videotestsrc	LGPLv2.1+
gst-plugins-bad	opengl	LGPLv2.1+
gst-plugins-good	vpx	LGPLv2.1+
gst-plugins-bad (was in openwebrtc-gst-plugins)	dtls	BSD 2-clause
libnice	nice	LGPLv2.1+
gst-plugins-bad (was in openwebrtc-gst-plugins)	openh264	BSD 2-clause
gst-plugins-good	pulseaudio	LGPLv2.1+
openwebrtc-gst-plugins	sctp	BSD 2-clause
gst-plugins-bad	srtp	LGPLv2.1+
gst-plugins-bad	opus	LGPLv2.1+
openwebrtc-gst-plugins	videorepair	BSD 2-clause

OpenWebRTC Project

Project	License
openwebrtc	BSD 2-clause
openwebrtc-gst-plugins	BSD 2-clause
openwebrtc-android-sdk	BSD 2-clause
openwebrtc-ios-sdk	BSD 2-clause
openwebrtc-examples	BSD 2-clause
bowser	BSD 2-clause