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Open-source licences

PrePost Sync is built on open-source software. These are the components it includes, their licences, and the exact FFmpeg source code the app is built from.

Last updated 26 September 2026

  1. 1.FFmpeg 7.1

    This software uses libraries from the FFmpeg project under the LGPLv2.1: libavcodec, libavformat, libavutil, libswscale and libswresample. Copyright © the FFmpeg developers. We do not own FFmpeg.
    They are built from the unmodified FFmpeg 7.1 release as an LGPL-only build, with no GPL or non-free components, and are linked dynamically. They live in PrePost Sync.app/Contents/Frameworks, and you may replace them with your own build of the same major versions. Re-sign the app afterwards with codesign --force --deep --sign - "PrePost Sync.app".

  2. 2.Python 3.11

    Copyright © 2001 Python Software Foundation. Licensed under the Python Software Foundation License Version 2 — Python-LICENSE.txt. The bundled interpreter includes:
    • OpenSSL 3.5 — Apache License 2.0 (Apache-2.0.txt). Copyright © 1998–2025 The OpenSSL Project Authors.
    • SQLite — public domain.
    • zlib — zlib licence. Copyright © Jean-loup Gailly and Mark Adler.
    • Expat — MIT licence. Copyright © Thai Open Source Software Center Ltd and Clark Cooper; the Expat maintainers.
    • libmpdec — BSD 2-Clause. Copyright © Stefan Krah.
    • libffi — MIT licence. Copyright © Anthony Green, Red Hat, Inc. and others.
    • xz / liblzma — 0BSD / public domain.
    • bzip2 — BSD-style licence. Copyright © Julian R Seward.

  3. 3.NumPy 2.4

    Copyright © 2005–2025, NumPy Developers. Licensed under the BSD 3-Clause licence — NumPy-LICENSE.txt, which also covers the libraries NumPy bundles: OpenBLAS (BSD 3-Clause), and libgfortran, libquadmath and libgcc_s (GNU GPL v3 with the GCC Runtime Library Exception v3.1, which permits their redistribution with this application).

  4. 4.The full notices

    The complete notices are in THIRD_PARTY_NOTICES.txt. The same text ships inside the app, under Help › Acknowledgements and in PrePost Sync.app/Contents/Resources/Licenses.