Open source licenses

FFmpeg, and the written source offer

Ninja uses FFmpeg n8.1.2, unmodified, as a dynamically loaded shared library under the GNU Lesser General Public License v3.0. Because it is a separate shared library, you are free to replace it in the app with an interface-compatible build of your own.

Written offer, valid for three years from the day you received the app: on request we will give any holder of it a complete machine-readable copy of the corresponding source for the LGPL-covered libraries in this build — FFmpeg n8.1.2 and the libraries linked into it — together with the scripts used to configure and build them, and copies of the GNU GPL v3 and LGPL v3, for a fee no greater than our cost of performing the distribution.

Write to support@ninjacompress.app and quote the app version shown on the Settings screen. The same source is public: ffmpeg.org/download (FFmpeg, tag n8.1.2) and the ffmpeg-kit build scripts at github.com/arthenica/ffmpeg-kit and github.com/sk3llo/ffmpeg_kit_flutter.

Licenses

Component	License	Full text
FFmpeg n8.1.2 Copyright (c) the FFmpeg developers. Licensed under the GNU LGPL v3.0 (built with --enable-version3, and without --enable-gpl or --enable-nonfree) — so no libx264, libx265 or xvid is present anywhere in the app. H.264 and HEVC encoding goes through the operating system's hardware encoders. Dynamically linked and replaceable; source offer below.	GNU LGPL v3.0	LGPL-3.0.txt
GNU GPL v3 The GNU General Public License, version 3 — the document LGPL v3 is written as a set of additional permissions to.	Referenced by the LGPL v3	GPL-3.0.txt
FFmpeg components Parts of FFmpeg, and several of the libraries linked into it, are licensed under the GNU LGPL v2.1 or later. The written offer covers them too.	GNU LGPL v2.1	LGPL-2.1.txt
Apache License 2.0 AndroidX Media3, AndroidX Core KTX, Kotlin, kotlinx.coroutines, and Apache-licensed libraries linked into FFmpeg.	Apache-2.0	Apache-2.0.txt
Inter Copyright 2020 The Inter Project Authors.	SIL Open Font License 1.1	OFL-Inter.txt
Space Grotesk Copyright 2020 The Space Grotesk Project Authors.	SIL Open Font License 1.1	OFL-SpaceGrotesk.txt
JetBrains Mono Copyright 2020 The JetBrains Mono Project Authors.	SIL Open Font License 1.1	OFL-JetBrainsMono.txt

Libraries linked into FFmpeg

These are compiled into the FFmpeg shared libraries themselves, so they ship with the app even though Ninja never calls them directly.

dav1d — BSD 2-Clause
fontconfig — MIT-style (fontconfig license)
FreeType — FreeType License (BSD-style, credit required)
FriBidi — LGPL v2.1 or later
GMP — LGPL v3 or later
GnuTLS — LGPL v2.1 or later (Android build)
HarfBuzz — MIT (Old MIT)
libass — ISC
libilbc — BSD 3-Clause
libaom — BSD 2-Clause + AOM patent license (iOS build)
LAME — LGPL v2 or later
libopencore-amrnb — Apache 2.0
libvo-amrwbenc — Apache 2.0
libwebp — BSD 3-Clause
libxml2 — MIT
kvazaar — BSD 3-Clause
OpenH264 — BSD 2-Clause, Cisco (iOS build)
OpenSSL — Apache 2.0 (iOS build)
Opus — BSD 3-Clause
Shine — LGPL v2.1
Snappy — BSD 3-Clause
SoX Resampler (soxr) — LGPL v2.1 or later
Speex — BSD 3-Clause
SRT — Mozilla Public License 2.0 (iOS build)
Tesseract — Apache 2.0 (iOS build)
Theora — BSD 3-Clause
TwoLAME — LGPL v2.1
Vorbis — BSD 3-Clause
libvpx — BSD 3-Clause + patent grant
zimg — WTFPL
zlib — zlib license
bzip2 — BSD-style bzip2 license (iOS build)

Platform libraries

AndroidX Media3 (Transformer, Effect, Common, Muxer) — Apache 2.0
AndroidX Core KTX — Apache 2.0
Kotlin and kotlinx.coroutines — Apache 2.0
SQLite — public domain

The Flutter framework and every Dart package the app uses are listed in full inside the app, under Settings → Licenses → All Dart packages.

This website

The site uses the same three typefaces as the app, self-hosted under the SIL Open Font License, and is built with Astro (MIT).