# Third-party software

The lightweight SlowMySong Studio release includes the frontend libraries in
`web/vendor/` and the font with its license in `web/fonts/LICENSE.txt`. Library
notices remain in their bundled JavaScript files. Python, Qt for Python (PySide6
and Shiboken), Qt, Chromium/Qt WebEngine and FFmpeg are installed separately by
the user; their upstream distributions provide their own license notices.

Optional frozen native builds additionally redistribute Python and Qt. Those
builds collect available package licenses in `licenses/` next to the app assets.

Python: https://www.python.org/psf/license/
Qt for Python: https://doc.qt.io/qtforpython-6/licenses.html
Qt and Chromium notices: https://doc.qt.io/qt-6/qtwebengine-licensing.html
PyInstaller: https://pyinstaller.org/en/stable/license.html

For optional frozen native releases, Qt's shared libraries remain separate files
in the application directory. Users
can replace them with compatible modified versions; this distribution does not
prohibit reverse engineering required to debug modifications to LGPL components.
The frozen build pins Qt 6.11.2 and PySide/Shiboken 6.11.2, without changes to their
source. Complete corresponding source, build files, and upstream license notices
are available from The Qt Company's archive:

- Qt (including Qt WebEngine and its bundled Chromium):
  https://download.qt.io/archive/qt/6.11/6.11.2/single/qt-everywhere-src-6.11.2.tar.xz
- PySide and Shiboken:
  https://download.qt.io/official_releases/QtForPython/pyside6/PySide6-6.11.2-src/pyside-setup-everywhere-src-6.11.2.tar.xz

`sources.json` and `build-info.json` record the actual versions used to build each
artifact. Source can be downloaded without an account. The archive contains the
build instructions and individual third-party license notices. To rebuild the
bindings, follow `README.md` in pyside-setup and Qt's `configure`/CMake instructions
in the Qt archive. The shared Qt libraries are separate and can be replaced by
compatible modified builds in the installed application's `_internal/PySide6`
directory (or the corresponding frameworks directory inside the macOS `.app`).

FFmpeg is a separate optional executable. Default builds use the system's FFmpeg
and do not redistribute it. Linux Debian packages declare an FFmpeg dependency.
When bundling FFmpeg, the build requires both a binary directory and an archive
of its complete corresponding source (including enabled dependencies and build
instructions). That source archive accompanies the installer in the release
directory. Do not substitute a generic FFmpeg source release for a differently
configured third-party binary. FFmpeg licensing:
https://ffmpeg.org/legal.html

Public desktop archives have no YouTube download integration. They import files
selected by the user and process them locally. The owner's personal source copy
retains its separate optional downloader and is not distributed publicly.