Pica Pica software is licensed under GPL-3.0-only:

Copyright (c) 2012-2020, Anton Sviridenko

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, version 3.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.

Pica Pica uses OpenSSL
libraries and binary for maintaining secure connections, managing keys and other tasks.
OpenSSL libraries and binary may be  included in Pica Pica binary packages.

This product includes software developed by the OpenSSL Project for use
 in the OpenSSL Toolkit. (http://www.openssl.org/)