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Third-Party Notices

TeleMatrix is distributed under the GNU General Public License v3.0 or later (with an OpenSSL linking exception); see LICENSE and LEGAL. It incorporates and links the third-party components listed below. Each is the property of its respective authors and is used under the license noted. All of these licenses are compatible with GPLv3, which governs the combined work.

C++ / UI

Desktop App Toolkit — GPL-3.0-or-later (with OpenSSL exception)

Modules: lib_ui, lib_base, lib_rpl, lib_crl, codegen, cmake_helpers. Source: https://github.com/desktop-app Copyright (c) 2014-2026 The Desktop App Toolkit Authors.

Vendored as git submodules under lib/. Only the bundled fonts resource (lib/lib_ui/fonts/fonts.qrc) is compiled into TeleMatrix — the toolkit's GPL C++ code is not linked (the src/ui/ widgets are original reimplementations).

Bundled fonts (via lib_ui/fonts/fonts.qrc)

  • Open Sans — Apache-2.0. Copyright the Open Sans Project Authors.
  • Vazirmatn — SIL Open Font License 1.1. Copyright the Vazirmatn Project Authors.

Qt 6 — LGPL-3.0 (open source edition)

Components used: Core, Gui, Widgets, Multimedia, Concurrent, Svg. Source: https://www.qt.io — Copyright (c) The Qt Company Ltd. On macOS the build bundles Qt's FFmpeg multimedia backend (libffmpegmediaplugin.dylib) so QMediaPlayer can stream video from the in-process loopback proxy; see the FFmpeg entry below for the bundled libav.

FFmpeg (libav) — LGPL-2.1-or-later / GPL-2.0-or-later

Libraries: libavcodec, libavformat, libavutil, libswscale, libswresample. Source: https://ffmpeg.org — Copyright (c) the FFmpeg developers. Used in two places, both compatible with the GPLv3 governing the combined work:

  • Video thumbnails — Rust (rust/) via the ffmpeg-next crate linking the system libav, decoding one frame for the timeline poster image.
  • Video playback on macOS — Qt's FFmpeg multimedia backend (libffmpegmediaplugin.dylib), bundled into TeleMatrix.app and used by QMediaPlayer. Depending on the FFmpeg build, some components are under GPL-2.0-or-later rather than LGPL; both are GPLv3-compatible.

Microsoft GSL — MIT

Source: https://github.com/microsoft/GSL — Copyright (c) 2015 Microsoft Corporation.

expected (TartanLlama) — CC0-1.0 (public domain dedication)

Source: https://github.com/TartanLlama/expected

Rust backend (rust/)

matrix-rust-sdk — Apache-2.0

Crates: matrix-sdk, matrix-sdk-ui, matrix-sdk-crypto (0.16). Source: https://github.com/matrix-org/matrix-rust-sdk Copyright The Matrix.org Foundation C.I.C. and contributors.

Apache-2.0 attribution (required by section 4): this product includes software developed by The Matrix.org Foundation C.I.C., licensed under the Apache License, Version 2.0 (https://www.apache.org/licenses/LICENSE-2.0). Apache-2.0 code may be relicensed into a GPLv3 work; the combined binary is therefore distributed under GPLv3.

Rust crates — MIT OR Apache-2.0 (unless noted)

tokio, libc, async-trait, anyhow, serde, serde_json, futures-util, eyeball-im, mime, dirs, tracing, tracing-subscriber, rand, sha2, hkdf, chacha20poly1305.

  • reqwest/TLS — MIT/Apache-2.0; uses the rustls backend (rustls: Apache-2.0 / MIT / ISC). matrix-sdk and matrix-sdk-ui are pinned to default-features = false
    • rustls-tls, so native-tls/OpenSSL libssl is not linked for HTTP.
  • OpenSSL libcrypto — Apache-2.0 (OpenSSL 3.x). Linked only via rusqlite bundled-sqlcipher (SQLCipher's crypto); libssl is not linked. The GPLv3 OpenSSL linking exception (see LEGAL) covers this libcrypto linkage.
  • RustCrypto crates (sha2, hkdf, chacha20poly1305) — MIT/Apache-2.0.

Bundled storage

  • SQLite — Public Domain.
  • SQLCipher (via rusqlite bundled-sqlcipher) — BSD-3-Clause-style license, Copyright (c) Zetetic LLC.

Notes

  • This file covers the direct, intentionally vendored/linked dependencies. Transitive Rust crates are overwhelmingly MIT / Apache-2.0 / BSD / ISC permissive licenses, all GPLv3-compatible. To produce a complete crate-level manifest for distribution, run cargo install cargo-about (or cargo-license) in rust/ and regenerate.
  • This document is informational and is not a substitute for legal advice.