SOFTWARE
With releases starting in 2015 software is released in the GNU GPL3 (General Public License version 3) as published by the Free Software Foundation. See http://www.gnu.org/licenses/ for additional details.
HARDWARE
And Hardware will be released under the Creative Commons "Attribution - ShareAlike" 4.0 license.
Full details may be found here: http://creativecommons.org/licenses/by-sa/4.0/
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Works (hardware and software) released prior to 2015 used the Creative Commons "Attribution - NonCommercial - ShareAlike" licence.
Full details are here: http://creativecommons.org/licenses/by-nc-sa/3.0/
