OpenVDB is released under the Mozilla Public License Version 2.0, which is a free, open source, and detailed software license developed and maintained by the Mozilla Foundation. It is a hybrid of the modified BSD license and the GNU General Public License (GPL) that seeks to balance the concerns of proprietary and open source developers.
Contributor License Agreement
Developers who wish to contribute code to be considered for inclusion in the OpenVDB distribution must first complete this Contributor License Agreement and submit it to DreamWorks (directions are in the CLA). We prefer code submissions in the form of pull requests to the OpenVDB Development Repository on GitHub, and all code should adhere to the OpenVDB coding standards.