LEGAL NOTICE
This page provides complete attribution and license information for every open-source component used by Subtitle Studio — including the speech, alignment and translation models, the media tooling, and every bundled typeface — ensuring full compliance with all applicable licenses.
Subtitle Studio
Copyright (c) 2026 Subtitle Studio. All Rights Reserved.
This product includes software developed by third parties, including:
Subtitle Studio lets you choose from several Whisper-family models, which are downloaded from the application's model CDN at runtime. Each model is packaged as a whisper.cpp compatible GGML binary and retains the license of its upstream Hugging Face repository. You may also supply your own .bin / .gguf whisper.cpp compatible model files.
Whisper Large V2 / Whisper Large V3 (OpenAI)
Whisper Large V3 — Cantonese GGML
Breeze ASR 25 — Taiwanese Mandarin (MediaTek Research)
Breeze ASR 26 — Taiwanese Hokkien / Taigi (MediaTek Research)
Citation:
@article{radford2022whisper,
title={Robust Speech Recognition via Large-Scale Weak Supervision},
author={Radford, Alec and Kim, Jong Wook and Xu, Tao and Brockman, Greg and
McLeavey, Christine and Sutskever, Ilya},
journal={arXiv preprint arXiv:2212.04356},
year={2022}
}whisper.cpp (v1.8.2)
whisper/engine/ for on-device transcription inference. Uses GGML (MIT).GGML (v0.13.1)
NVIDIA CUDA Runtime — optional GPU acceleration, Windows
whisper-cublas-12.4.0-bin-x64.zip)cudart64_12.dll, cublas64_12.dll and cublasLt64_12.dll — is downloaded at runtime into the user data directory (whisper-cuda-engine/) and can be removed again from the GPU Acceleration dialog. These libraries are the NVIDIA redistributables permitted for redistribution under the CUDA Toolkit EULA; the NVIDIA display driver itself is supplied by you. The whisper.cpp binaries in the same asset remain MIT-licensed.whisper.cpp Vulkan build — optional GPU acceleration, Windows / AMD
.github/workflows/build-whisper-vulkan.yml, hosted at https://assets.subtitlestudio.ai/packages/)whisper-cli.exe, whisper.dll, ggml.dll, ggml-base.dll, ggml-cpu.dll and ggml-vulkan.dll, including the SPIR-V compute shaders compiled into the last of these from whisper.cpp's own GLSL. When you opt in to GPU acceleration on an AMD machine it is downloaded at runtime into the user data directory (whisper-vulkan-engine/) and can be removed again from the GPU Acceleration dialog. Nothing from the LunarG Vulkan SDK is redistributed: it is a build-time dependency only, and the Vulkan loader (vulkan-1.dll) on your machine comes from your Radeon driver.Qwen3 Forced Aligner 0.6B (Alibaba Cloud / Qwen Team)
qwen3-asr.cpp (Forced Aligner Runtime)
forced-aligner/ for on-device forced alignment inference. Uses GGML (MIT).Qwen3-4B-Instruct-2507 (Alibaba Cloud / Qwen Team)
qwen3-4b-instruct-2507-q4_k_m.gguf) is downloaded at runtime from the application's model CDN; the upstream Hugging Face repository is the authoritative license source. Paper: Qwen Team, "Qwen3 Technical Report" (arXiv:2505.09388).llama.cpp (Translation LLM Runtime)
translation-llm/engine/ for on-device translation inference. Uses GGML (MIT).DeepFilterNet (Windows)
deep-filter binary is shipped in denoise/ on Windows and fetched by scripts/setup-deep-filter.js. It is statically linked and embeds its own model weights; upstream's dual license covers the code and the weights together. Windows uses it in place of the macOS AVFoundation/Cinematic helper, which has no Windows equivalent. Papers: Schröter et al., "DeepFilterNet2: Towards Real-Time Speech Enhancement on Embedded Devices for Full-Band Audio" (arXiv:2205.05474); "DeepFilterNet: Perceptually Motivated Real-Time Speech Enhancement" (arXiv:2305.08227).AVFoundation Cinematic Audio Mix (macOS)
swift/remove-background.swift. Requires macOS 26 or later.Silero VAD (v6.2.0)
vad/ggml-silero-v6.2.0.bin is bundled with the application and used by the whisper.cpp VAD front-end to skip silence before transcription. Silero VAD is published under the MIT license with no usage restrictions, and the license covers the model weights as well as the code.Every typeface bundled with Subtitle Studio is licensed under the SIL Open Font License, Version 1.1. The full license text, together with the copyright notice reproduced from each font file's own name table, ships with the application as licenses/OFL-1.1.txt and is reachable from Help → Font Licenses (OFL 1.1). All fonts are shipped unmodified and none is distributed under a Reserved Font Name belonging to another party.
| Typeface | In-app name | Copyright | Upstream |
|---|---|---|---|
| Noto Sans TC | 思源黑體 | © 2014–2021 Adobe, RFN 'Source' | notofonts/noto-cjk |
| Noto Serif TC | 思源宋體 | © 2017–2024 Adobe | notofonts/noto-cjk |
| Source Han Serif HC | 思源宋體 HC | © 2017–2024 Adobe, RFN 'Source' | adobe-fonts/source-han-serif |
| ChillDuanHeiSong (寒蟬端黑宋) | 寒蟬端黑宋 | © 2023 ChillType, RFN 'DuanHei'; derived from Source Han Serif (© 2017–2022 Adobe, RFN 'Source') | chiller-type.com |
| Gen Jyuu Gothic | 源柔黑體 | Source Han Sans © 2014–2015 Adobe, RFN 'Source'; M+ OUTLINE FONTS © 2015 M+ FONTS PROJECT | ButTaiwan/genjyuugothic |
| GenSekiGothic2 TW | — (UI only) | Derived from Source Han Sans, RFN 'Source' | ButTaiwan/genseki-font |
| GenSenRounded2 TW | — (unused) | Derived from Source Han Sans, RFN 'Source' | ButTaiwan/gensen-font |
| jf open 粉圓 2.1 | jf open 粉圓 | © 2020–2024 justfont Co., Ltd.; derived from Kosugi Maru (© 2010 MOTOYA) and Varela Round (© 2011–2016, RFN 'Varela'/'Varela Round') | justfont/open-huninn-font |
| Mantou Sans | 饅頭黑體 | © Mant0u / artakana; derived from Dela Gothic One | mant0u0/MantouSans |
| NaniFont | 何某手寫體 | © 2016–2020 Nanigashitei, RFN 'Otsutome_font' | max32002/nanifont |
| Typeface | Copyright | Upstream |
|---|---|---|
| Inter | © 2016 The Inter Project Authors (“Inter” is a trademark of Rasmus Andersson) | rsms/inter |
| EB Garamond | © 2017 The EB Garamond Project Authors | octaviopardo/EBGaramond12 |
| Newsreader | © 2020 The Newsreader Project Authors (“Newsreader” is a registered trademark of Production Systems SAS) | productiontype/Newsreader |
| Instrument Serif | © 2022 The Instrument Serif Project Authors | Instrument/instrument-serif |
| Geist | © 2024 The Geist Project Authors (Vercel) | vercel/geist-font |
| Geist Mono | © 2024 The Geist Project Authors (Vercel) | vercel/geist-font |
Geist and Geist Mono are the application's own interface typefaces. They are fetched at build time by next/font/google and self-hosted inside the application's web assets rather than loaded from a Google server at runtime, so they are redistributed with the app and are covered by the notice above.
Inter, EB Garamond and Newsreader appear in the subtitle style picker as open-licensed stand-ins for Neue Helvetica (Monotype), Apple Garamond (Apple/ITC) and Scholar (Great Studio). Those three typefaces are not redistributable and are not included in this software; only the open-licensed substitutes are shipped, each under its own real name.
You may import your own font files through the subtitle style panel. Those files are read from your own disk, are never bundled or uploaded, and remain subject to whatever licence you hold for them.
--enable-version3; a build configured with --enable-gpl is covered by the GPL instead.| Platform | Version | License of this build | Source for this build |
|---|---|---|---|
| macOS (arm64) | N-124444-g4851060ccd | LGPL 3.0 (--enable-version3 --disable-gpl --disable-nonfree) | FFmpeg @ 4851060ccd |
| Windows (x64) | release-essentials (gyan.dev) | GPL 3.0 — the gyan.dev essentials builds are configured with --enable-gpl | gyan.dev/ffmpeg/builds |
| Linux (x64 / arm64) | latest release (John Van Sickle) | GPL 3.0 — all static builds published there are GPL 3.0 | johnvansickle.com/ffmpeg |
On Windows and Linux the binaries are third-party GPL 3.0 builds. Subtitle Studio does not link against them and does not redistribute them: they are fetched from their publishers' own servers at your request, run as separate processes over a command-line interface, and can be replaced by you with any other FFmpeg build (see Replacing FFmpeg/FFprobe below). No part of Subtitle Studio is derived from FFmpeg. The corresponding sources for each of these builds are available from their publishers and from https://git.ffmpeg.org/ffmpeg.git.
built with Apple clang version 17.0.0 (clang-1700.6.3.2) configuration: --enable-static --disable-shared --enable-pthreads --enable-version3 --enable-audiotoolbox --enable-videotoolbox --disable-gpl --disable-nonfree libavutil 60.30.100 | libavcodec 62.31.100 | libavformat 62.15.100 libavdevice 62. 4.100 | libavfilter 11.17.100 | libswscale 9. 7.100 libswresample 6. 4.100
Compliance: binaries are downloaded separately at runtime and are not bundled with the application. You may replace them with your own builds — see Replacing FFmpeg/FFprobe below.
You can replace the FFmpeg and FFprobe binaries with your own builds by dropping them into these directories:
macOS ~/Library/Application Support/Subtitle Studio/ffmpeg-binaries/ Windows %APPDATA%\Subtitle Studio\ffmpeg-binaries\ Linux ~/.config/Subtitle Studio/ffmpeg-binaries/
To build FFmpeg from source yourself:
git clone https://git.ffmpeg.org/ffmpeg.git cd ffmpeg ./configure --enable-gpl=no --enable-version3=no make make install
For detailed instructions, visit https://ffmpeg.org/download.html#build.
This software includes the following npm packages:
React (v19.2.0)
Next.js (v16.0.3)
Electron (v39.2.3)
Radix UI — React Tooltip (v1.2.8), React Dropdown Menu (v2.1.16)
Heroicons React (v2.2.0)
Tailwind CSS (v4)
Motion / framer-motion (v12.38.0)
Tailwind Merge (v3.4.0)
TailwindCSS Animate (v1.0.7)
clsx (v2.1.1)
fluent-ffmpeg (v2.1.3)
opencc-js (v1.0.5)
libvips (via Sharp) — @img/sharp-libvips-darwin-arm64
!node_modules/@img/** and !node_modules/sharp/** rules in package.json > build.files, so no LGPL binary is shipped. Where it is used during a build it is dynamically linked and replaceable.lightningcss
TypeScript (v5)
ESLint (v9)
electron-builder (v26.0.12)
concurrently (v9.2.1)
cross-env (v10.1.0)
wait-on (v9.0.3)
esbuild (v0.27.0)
baseline-browser-mapping (v2.9.11)
This software uses TypeScript type definitions from DefinitelyTyped:
caniuse-lite
For a complete list of all dependencies and their licenses, run:
yarn licenses listOr refer to the THIRD_PARTY_LICENSES.md file included with this software.
Subtitle Studio is committed to complying with all open-source licenses:
1. MIT and Apache-2.0 components:
The majority of components — whisper.cpp, GGML, llama.cpp, qwen3-asr.cpp, Silero VAD, the Whisper and Qwen3 models and most npm packages — use the MIT or Apache 2.0 licenses, which permit use, modification and distribution with attribution. Full license texts are reproduced below.
2. LGPL / GPL components:
No LGPL- or GPL-licensed component is linked into the application. FFmpeg and FFprobe are downloaded at runtime from their publishers, invoked as separate processes, and replaceable by you; the macOS build is LGPL 3.0 and the Windows and Linux builds are GPL 3.0 builds published by gyan.dev and John Van Sickle respectively. libvips (via Sharp) is used at build time only and is excluded from the packaged application. Sources and build instructions for all of them are available upstream.
3. Fonts:
Every bundled typeface is SIL OFL 1.1. The full licence text and the copyright notice for each font ship with the application as licenses/OFL-1.1.txt, satisfying clause 2 of the OFL. No font is sold, no font is modified, and no Reserved Font Name is reused.
4. Attribution:
Proper attribution is provided for all CC-BY, MPL and BSD-licensed components.
5. Source availability:
Source code and build instructions for all copyleft components are available from their respective upstream projects.
We are deeply grateful to all the maintainers and contributors of the open-source projects listed above. Their work has made this software possible.
Special thanks to:
For questions about licensing or attribution, please contact: hello@subtitlestudio.ai
For more information about third-party licenses, see:
THIRD_PARTY_LICENSES.md (detailed license information, shipped with the app)licenses/OFL-1.1.txt (font licences, also under Help → Font Licenses)LICENSE.md (Subtitle Studio proprietary license)The following section contains the complete text of the open-source licenses used by components in Subtitle Studio. This ensures full legal compliance with attribution requirements.
Used by: whisper.cpp, GGML, llama.cpp, qwen3-asr.cpp, Silero VAD, Whisper (OpenAI), React, Next.js, Electron, Radix UI, Heroicons, Tailwind CSS, Motion, clsx, tailwind-merge, tailwindcss-animate, fluent-ffmpeg, opencc-js, ESLint, electron-builder, concurrently, cross-env, wait-on, esbuild, baseline-browser-mapping, DefinitelyTyped types
MIT License Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Used by: Whisper Large V3 Cantonese GGML, Breeze ASR 25, Breeze ASR 26, Qwen3 Forced Aligner 0.6B, Qwen3-4B-Instruct-2507, DeepFilterNet (at your option), TypeScript
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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that control, are controlled by, or are under common control with that entity.
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but not limited to software source code, documentation source, and
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END OF TERMS AND CONDITIONS
Full license text: http://www.apache.org/licenses/LICENSE-2.0Used by: FFmpeg and FFprobe (downloaded at runtime), libvips via Sharp (build-time only)
Subtitle Studio does not link against any LGPL- or GPL-licensed component. The macOS FFmpeg build is LGPL 3.0 (--disable-gpl --disable-nonfree); the Windows and Linux builds published by gyan.dev and John Van Sickle are GPL 3.0. All of them are downloaded from their publishers at your request, run as separate processes over a command-line interface, and can be replaced by you at any time. libvips is used only while the site is built and is excluded from the packaged application.
FFmpeg source code:
https://git.ffmpeg.org/ffmpeg.gitFFmpeg license information:
https://ffmpeg.org/legal.htmllibvips source code:
https://github.com/libvips/libvipsFull LGPL 2.1 license text:
https://www.gnu.org/licenses/old-licenses/lgpl-2.1.htmlFull LGPL 3.0 license text:
https://www.gnu.org/licenses/lgpl-3.0.htmlFull GPL 3.0 license text:
https://www.gnu.org/licenses/gpl-3.0.htmlUsed by: lightningcss (build-time only)
MPL-2.0 is a file-level copyleft licence: covered source files remain under the MPL and their source must stay available, but the covered work may be redistributed as part of a larger proprietary work. lightningcss is shipped unmodified.
Full license text:
https://www.mozilla.org/en-US/MPL/2.0/Used by: caniuse-lite (browser compatibility data)
You are free to share and adapt the material for any purpose, even commercially, provided you give appropriate credit, provide a link to the license, and indicate if changes were made.
Source:
https://caniuse.com/Full license text:
https://creativecommons.org/licenses/by/4.0/legalcodeUsed by: every bundled typeface — Noto Sans TC, Noto Serif TC, Source Han Serif HC, ChillDuanHeiSong, Gen Jyuu Gothic, GenSekiGothic2 TW, GenSenRounded2 TW, jf open 粉圓, Mantou Sans, NaniFont, Inter, EB Garamond, Newsreader, Instrument Serif, Geist, Geist Mono
SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007 PREAMBLE The goals of the Open Font License (OFL) are to stimulate worldwide development of collaborative font projects, to support the font creation efforts of academic and linguistic communities, and to provide a free and open framework in which fonts may be shared and improved in partnership with others. The OFL allows the licensed fonts to be used, studied, modified and redistributed freely as long as they are not sold by themselves. The fonts, including any derivative works, can be bundled, embedded, redistributed and/or sold with any software provided that any reserved names are not used by derivative works. The fonts and derivatives, however, cannot be released under any other type of license. The requirement for fonts to remain under this license does not apply to any document created using the fonts or their derivatives. DEFINITIONS "Font Software" refers to the set of files released by the Copyright Holder(s) under this license and clearly marked as such. This may include source files, build scripts and documentation. "Reserved Font Name" refers to any names specified as such after the copyright statement(s). "Original Version" refers to the collection of Font Software components as distributed by the Copyright Holder(s). "Modified Version" refers to any derivative made by adding to, deleting, or substituting -- in part or in whole -- any of the components of the Original Version, by changing formats or by porting the Font Software to a new environment. "Author" refers to any designer, engineer, programmer, technical writer or other person who contributed to the Font Software. PERMISSION & CONDITIONS Permission is hereby granted, free of charge, to any person obtaining a copy of the Font Software, to use, study, copy, merge, embed, modify, redistribute, and sell modified and unmodified copies of the Font Software, subject to the following conditions: 1) Neither the Font Software nor any of its individual components, in Original or Modified Versions, may be sold by itself. 2) Original or Modified Versions of the Font Software may be bundled, redistributed and/or sold with any software, provided that each copy contains the above copyright notice and this license. These can be included either as stand-alone text files, human-readable headers or in the appropriate machine-readable metadata fields within text or binary files as long as those fields can be easily viewed by the user. 3) No Modified Version of the Font Software may use the Reserved Font Name(s) unless explicit written permission is granted by the corresponding Copyright Holder. This restriction only applies to the primary font name as presented to the users. 4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font Software shall not be used to promote, endorse or advertise any Modified Version, except to acknowledge the contribution(s) of the Copyright Holder(s) and the Author(s) or with their explicit written permission. 5) The Font Software, modified or unmodified, in part or in whole, must be distributed entirely under this license, and must not be distributed under any other license. The requirement for fonts to remain under this license does not apply to any document created using the Font Software. TERMINATION This license becomes null and void if any of the above conditions are not met. DISCLAIMER THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
Last Updated: September 8, 2026
This page is provided to ensure full compliance with all open-source license requirements.