Dependencies and 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 For specific licenses, you need to find each project's license text - see here for an outdated list.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.
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.
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.
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:
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.
| Project | License |
|---|---|
| cerbero | LGPLv2.1 |
| 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 |
| 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 |
| 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 |
| 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 |