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The Delta firmware is licensed under the GNU General Public License, version 3 (GPL v3).

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Why GPL v3

The Delta firmware is a derivative work of the VESC project (vedderb/bldc), which is itself licensed under GPL v3. The license carries forward to derivative works, so the Delta firmware is distributed under the same terms.

Full license text

GNU General Public License v3.0 — gnu.org

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What this means for you

Run the firmware on your hardware, commercially or otherwise, without restriction or fee.
Change the source however you like for your own use.
Distributing the firmware — modified or not, on its own or loaded onto hardware you sell — obliges you to make the corresponding source available to the recipient under GPL v3, including your modifications.
The GPL disclaims all warranties. The firmware is provided as-is. See sections 15 and 16 of the license text.

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Source

Delta firmware

github.com/IntrusiveRobotics/Delta

Upstream VESC project

github.com/vedderb/bldc
See provenance for what the Delta firmware derives from and how it differs, and trademarks for the VESC® trademark position.
This page summarises the license in plain terms for convenience. The full GPL v3 text is the governing document — where this summary and the license differ, the license controls.
Last modified on September 1, 2026