Both FileZilla and FileZilla Server as downloadable from are free open-source software. FileZilla is distributed under the Terms and Conditions of the GNU General Public License (GPL) version 2 or (at your option) any later version. FileZilla Server is distributed under ther terms and conditions of the GNU Affero General Publice License version 3 or (at your option) any later version.

For using FileZilla and FileZilla Server, no restrictions apply. You can further redistribute and/or modify this software under the terms of the GPL or AGPL as applicable.

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.

For details, have a look at the full text of the GPL and the full text of the AGPL.