The app runs tor 0.4.9.14, unmodified, from the Tor Project's Tor Expert Bundle 15.0.25 (desktop) and its Android bundle of the same version (phones). This build of tor is covered by the GNU General Public License, version 3 (https://www.gnu.org/licenses/gpl-3.0.txt). Its source: https://dist.torproject.org/tor-0.4.9.14.tar.gz and the Tor Browser build at https://gitlab.torproject.org/tpo/applications/tor-browser-build (release 15.0.25).
