Before downloading, please read and accept these terms:

Freedoms: you may use, study, modify, and share this software.
Copyleft: if you distribute modified or compiled versions, you must publish the complete source code under the same GPL v 3.x license or later.
Source Code: when distributing binaries, you must provide the corresponding source code and build scripts.
Notices: retain copyright and license notices, and log your changes.
Patents & Anti-Tivoization: you cannot restrict others with patents; if the software is installed on a user product with verification, you must provide installation information.

No Warranty: this software is provided “as is”, without warranties or liability of any kind.

Full license text: https://www.gnu.org/licenses/gpl-3.0.html