Third-party software included in SOVYBE

@ffmpeg/ffmpeg 0.12.15: MIT, copyright Jerome Wu (2019).
@ffmpeg/core 0.12.10: GPL-2.0-or-later, FFmpeg and contributors.
pdf-lib 1.17.1: MIT, copyright Andrew Dillon (2019).
The upstream code and binary assets are unmodified. WASM is split only for
hosting and reassembled byte-for-byte before execution. The MediaEngine RPC
adapter and UI are in the supplied SOVYBE source ZIP.

Official corresponding source / build recipes for this core release:
https://github.com/ffmpegwasm/ffmpeg.wasm/tree/71aa99d37c02a7b4c435275ca9ef50e612f6efa1
https://github.com/ffmpegwasm/ffmpeg.wasm/blob/71aa99d37c02a7b4c435275ca9ef50e612f6efa1/Dockerfile
https://github.com/ffmpegwasm/ffmpeg.wasm/tree/71aa99d37c02a7b4c435275ca9ef50e612f6efa1/build
https://github.com/FFmpeg/FFmpeg/tree/n5.1.4
The Dockerfile identifies the Emscripten toolchain, FFmpeg version and all
external library repositories and branches used by the upstream core build.
Keep this notice and the accompanying license texts when distributing.
FFmpeg includes work from the Independent JPEG Group and other contributors;
their notices are in upstream sources. No upstream codec sources were modified.
These components are supplied without warranty, subject to their licenses.

Source archives and the upstream Dockerfile are also supplied at:
/vendor/sources/ (see upstream-urls.json and SHA256SUMS.txt).
Files larger than the Pages asset limit are split into .part1, .part2, etc.
Concatenate parts in numeric order to restore the original .tar.gz archive.
The SOVYBE source ZIP includes scripts/restore-source.mjs for that purpose.
These are upstream release sources/build inputs; a reproducible binary rebuild
has not been performed. Retain source access and notices when publishing.