On Android, slide show sounds and videos in legacy formats (WMV, WMA, ASF, AVI, MPEG)
are played with media_kit (MIT) and libmpv, which the app loads as a separate shared
library (libmpv.so), so it can be replaced by a modified build. Other media play
through the system's own player.

- mpv v0.36.0 (libmpv), built without GPL parts (-Dgpl=false): GNU Lesser General
  Public License 2.1 or later. Source: https://github.com/mpv-player/mpv
- FFmpeg n6.1.2 (libavcodec, libavformat, libavutil, libavfilter, libswresample,
  libswscale), configured with --disable-gpl --disable-nonfree --enable-version3 and
  only the decoders of legacy formats: GNU Lesser General Public License 3 or later.
  Source: https://ffmpeg.org/download.html
- Open-source source code: the complete corresponding source of libmpv.so (the exact
  mpv, FFmpeg, FriBidi, libass, FreeType and HarfBuzz sources, our one patch, the build
  script with its configure flags, and how to rebuild the library and replace it in the
  app) is published at https://pagiro.app/oss (pagiro-media-source-<app version>.tar.xz).
  For at least three years after we last distribute this version, we also send it to
  anyone who has the app on request to contact@tdhsoft.com, for no more than the cost
  of providing it.
- Also inside this build: libass 0.17.1 (ISC), FreeType 2.13.2 (FreeType License),
  HarfBuzz 8.3.0 ("Old MIT"), FriBidi 1.0.13 (LGPL 2.1 or later). Their full notices are
  separate entries of this licence screen (libass, FreeType, HarfBuzz).
- Portions of this software are copyright © 2023 The FreeType Project
  (www.freetype.org). All rights reserved.
