What is inside, and under which terms.

Just Play analyses and splits video with the ffmpeg and ffprobe programs of the FFmpeg project, shipped inside the app. They are distributed under the GNU Lesser General Public License, version 2.1 or later, built without any GPL or non-free component, and not modified.

The exact source code of the FFmpeg version inside the current release, the script that built it and its build configuration are in /downloads/sources/. They are published together with each release, so they always match the app you download here.

The full licence text, the build configuration and this same source offer are in the Licenses folder of the .dmg, and inside the app at Just Play.app/Contents/Resources/licenses/.

Write to dev@federicobernacca.com.