# Third-party notices

Voxbound is built with and distributes the following third-party software.

## FFmpeg — GNU LGPL v2.1 or later

Voxbound bundles binaries from the [FFmpeg project](https://ffmpeg.org)
(`ffmpeg.exe`, `ffprobe.exe`, `ffplay.exe`) and invokes them as separate
executables. The bundled build is the **LGPL** ("win64-lgpl") build, licensed
under the GNU Lesser General Public License, version 2.1 or later.

- License text: https://www.gnu.org/licenses/lgpl-2.1.html
- FFmpeg source code: https://ffmpeg.org/download.html
- The exact build distributed with Voxbound is BtbN FFmpeg-Builds release
  `autobuild-2026-09-21-13-55`, asset `ffmpeg-N-126734-ga9cbcc2bbb-win64-lgpl.zip`
  (FFmpeg git revision `N-126734-ga9cbcc2bbb`, SHA-256
  `d9e6450b2078201e2ffb53d55f4e4e2657f71663fd8603e4d2bf94d8c814df3c`):
  https://github.com/BtbN/FFmpeg-Builds/releases/tag/autobuild-2026-09-21-13-55
  The corresponding source is that revision of https://git.ffmpeg.org/ffmpeg.git;
  the release page links the build scripts used.

**Written offer.** For at least three (3) years from the date you received this
software, the complete corresponding source code for the FFmpeg build
distributed with Voxbound is available, at no more than the cost of distribution,
from the FFmpeg project and the BtbN FFmpeg-Builds release archive linked above.
Requests may also be sent to support@voxbound.app.

FFmpeg is not modified by Voxbound. FFmpeg is a trademark of Fabrice Bellard,
originator of the FFmpeg project.

## keyring — MIT License

macOS builds use the [keyring](https://github.com/jaraco/keyring) package
(`keyring>=25`, `licensing.py`) to store the licence activation in the user's
login keychain, in place of the Windows DPAPI encryption used on Windows.
`keyring>=25` and `truststore>=0.9` are installed only on macOS
(`requirements.txt`, `pyproject.toml`) and excluded from the Windows build
(`Voxbound.spec`), so neither ships in the Windows EXE.

A macOS build will also bundle keyring's own dependencies (currently the
`jaraco.classes`, `jaraco.functools` and `jaraco.context` packages, plus
`importlib_metadata`, `zipp`, `more-itertools` and `backports.tarfile`).
List each with its licence here once the macOS build job exists — they're
noted only in passing for now since none of them ship yet.

- Copyright Kang Zhang and contributors.
- License text: https://github.com/jaraco/keyring/blob/main/LICENSE

## truststore — MIT License

macOS builds use the [truststore](https://github.com/sethmlarson/truststore)
package (`truststore>=0.9`, `audiomerge.https_context`) so HTTPS calls
(Gumroad activation, update checks, book lookups) verify against the system
trust store, since a frozen build's bundled OpenSSL has no CA file of its own.

- Copyright Seth Michael Larson and contributors.
- License text: https://github.com/sethmlarson/truststore/blob/main/LICENSE

## Inter typeface (website only) — SIL Open Font License 1.1

The website's homepage is set in Inter, self-hosted as the subset woff2 files
`website/fonts/inter-{400,500,600}-normal-{latin,latin-ext}.woff2`, taken
unmodified from the `@fontsource/inter` 5.3.0 package. They are served by the
website only; the app doesn't bundle `website/fonts/`.

- Copyright 2016 The Inter Project Authors (https://github.com/rsms/inter)
- Licence text: `website/fonts/OFL-Inter.txt`, as shipped in that package
  (also at https://openfontlicense.org)

## DM Sans and Instrument Serif typefaces — SIL Open Font License 1.1

Voxbound's window is set in DM Sans and Instrument Serif. Six font files ship
with the app, in `_internal\webui\fonts\` inside the folder that holds
`Voxbound.exe` (`webui/fonts/` in the source): `dmsans-300-normal-latin.woff2`,
`dmsans-400-normal-latin.woff2`, `dmsans-500-normal-latin.woff2`,
`dmsans-600-normal-latin.woff2`, `instrumentserif-400-normal-latin.woff2` and
`instrumentserif-400-italic-latin.woff2`.

- Copyright 2014 The DM Sans Project Authors (https://github.com/googlefonts/dm-fonts)
- Copyright 2022 The Instrument Serif Project Authors (https://github.com/Instrument/instrument-serif)
- Licence texts: `OFL-DMSans.txt` and `OFL-InstrumentSerif.txt` in the same
  folder, as published in the `@fontsource/dm-sans` and
  `@fontsource/instrument-serif` 5.3.0 packages (also at https://openfontlicense.org)