The Biostar Engine is released under a dual license.
Contributing to the repository indicates acceptance of this license.
The default licensing of the code is made under the GNU General Public License (Version 3) as described in:
https://www.gnu.org/licenses/gpl-3.0.en.html
This license comes free of charge, is irrevocable and applies if no other agreements have been made.
For situations where the GNU General Public License requirements cannot be satisfied or would introduce onerous limitations we may allow the use of the software under different terms.
This alternative license is provided on a case by case basis, is not transferable, and requires prior written agreement.
The right to release the software under different terms is not transferable and is reserved to the copyright holders.