Open source & licenses
Last updated: 2 November 2026
Desktop application
The CueStream desktop app is based on OBS Studio and is distributed as a whole under the GNU General Public License, version 2 or later (GPL-2.0-or-later): you may run, study, modify and redistribute it under its terms.
Source code
Every version of the desktop app comes with the complete corresponding source code. You can also request it from Newa Produktion, Berlinerstr. 8, 51063 Köln, support@cuestream.de, for at least three years after we last distributed that version.
Open-source components in the app
| Component | Version | License | Used for |
|---|---|---|---|
| OBS Studio | 32.2.2 | GPL-2.0-or-later | the engine of the desktop app |
| DistroAV | 6.2.2 | GPL-2.0 | NDI input and output |
| Qt | 6.11.1 | LGPL-3.0 | user interface |
| Chromium Embedded Framework (CEF) | 6533 (Chromium 127) | BSD-3-Clause | browser inputs and graphics |
| FFmpeg | libavcodec 62 | LGPL-2.1-or-later / GPL-2.0-or-later | video and audio decoding and encoding |
| x264 | 164 | GPL-2.0-or-later | H.264 encoding |
| libdatachannel | 0.24.2 | MPL-2.0 | WebRTC connections to guests (with libjuice MPL-2.0, usrsctp BSD-3-Clause, libsrtp BSD-3-Clause) |
| Mbed TLS | 3.6.4 | Apache-2.0 | encryption (DTLS-SRTP) |
| SRT | 1.x | MPL-2.0 | SRT output |
| librist | 4.x | BSD-2-Clause | RIST output |
| FreeType | 2.x | FTL | text rendering |
| LuaJIT | 2.1 | MIT | OBS scripting |
| Monocypher | 4.0.2 | CC0-1.0 / BSD-2-Clause | licence signature check (Ed25519) |
The license text of every component ships with the app (macOS: CueStream.app › Contents › Resources). NDI® is a registered trademark of Vizrt NDI AB; the NDI Runtime is not shipped with the app, users install it themselves from ndi.video.
Online service
The CueStream guest cloud (accounts, billing, rooms and connection setup) is a separate online service operated by us. It talks to the desktop app only over a documented network protocol and is not part of the GPL-licensed program. It uses these open-source components:
| Component | Version | License |
|---|---|---|
| Go | 1.26 | BSD-3-Clause |
| pgx | 5.11.0 | MIT |
| stripe-go | 83.2.1 | MIT |
| coder/websocket | 1.8.15 | ISC |
| golang.org/x/crypto | 0.58.0 | BSD-3-Clause |
| PostgreSQL | 17 | PostgreSQL License |
| Caddy | 2.10 | Apache-2.0 |
| coturn | 4.7 | BSD-3-Clause |
Website and guest page
| Component | Version | License |
|---|---|---|
| Astro | 7.4.1 | MIT |
| Tailwind CSS | 4.3.3 | MIT |
| Inter | 5.3.0 | OFL-1.1 |
| Geist Mono | 5.3.0 | OFL-1.1 |
Trademarks
YouTube, Twitch, Facebook, vMix, StreamYard, OBS and other product names are trademarks of their respective owners and are used here for identification only.