The following licensing provisions apply to the Ornament & Crime (o_C) hardware design, the Ornament + Crime firmware and its source code bundle (repository), and to the associated documentation for both the hardware and the firmware and its source code.


The schematic for the o_C module is copyright M. Stadler and is released under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) license.

Anyone wishing to use the o_C schematic to create a derivative version of the o_C module hardware is welcome to do so provided that you observe the requirements of the CC-BY-NC-SA license.

PCB files

The Gerber files for the various versions of the o_C PCBs are copyright M. Stadler and are released under the Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

Anyone wishing to build o_C modules using PCBs produced from the PCB files is welcome to do so. If you are making copies of the PCBs for personal use or on behalf of a small group of people, there are no other considerations — please proceed. If you are making copies of the PCBs for commercial sale or as part of a large group-buy, please read the Considerations for licensees section of this Creative Commons document and note the request to comply with non-binding licensor preferences. For the Ornament & Crime PCB files, the licensor (M. Stadler) requests that anyone intending to undertake a large-scale (say, 20 or more) group-buy purchase of o_C PCBs or anyone intending to offer them for sale on a commercial basis informs him of such intentions via email.


The Ornament & Crime firmware bundle comprises all the source code contained in the O_C GitHub repositories at the following URLs, and any clones or copies of those repositories:

  • (canonical repository for released versions, as well as developmenatl versions)
  • (developmental repository)
  • (developmental repository)

Most of the individual source code files in the O_C firmware bundle (repository) have MIT license headers, and the copyright holders for them are shown in that header. A few files lack such headers, in which case, the files are copyright M.Stadler and P. Dowling, 2015, 2016, and should be considered to have an MIT license attached to them.

Some of the source code files have been written by third parties, and the relevant copyrights are shown in the license headers in those files. In particular, quite a few of the files are copyright O. Gillet 2013-2015, or are copyright P. Stoffregen (PJRC.COM LLC) 2012-2016, and have been released by their authors under an MIT license which permits their re-use and adaption as part of the o_C firmware bundle.

However, at least one source code file used in the O_C firmware bundle is licensed under the GNU Public License v3.0 (GPL3) — see drivers/SH1106_128x64_driver.cpp, because it is derived from code that was itself released under the GPLv3 license. Due to the “copyleft” provisions of the GPL3 license, the necessary inclusion of this file in the O_C firmware bundle means that all the source code contained in the O_C firmware bundle (i.e. in the o_C repositories), and any binary files derived from it, are all implicitly subject to the provisions of the GPLv3 license. Note that this only applies to the source code contained in the O_C bundle (and copies and clones thereof) used to create the O_C firmware binaries. Copies of third-party code obtained from their original third-party sources (e.g. source code from Olivier Gillet’s GitHub repository for the Mutable Instruments modules) are not subject to the GPLv3 provisions which apply to that source code as used and adapted in the O_C bundle.

Implications of the MIT and GPLv3 licenses

For DIY makers and end users of the o_C module, these licensing arrangements do not impose any additional burden or duties on you: you are free to build the module, use it, modify the firmware, and sell modules to others. If you sell modules to others (which means you are providing a copy of the firmware), please make sure the buyer is aware of this documentation here on GitHub — that will be sufficient to satisfy the following clause in the MIT license:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

For third-party module manufacturers wishing to re-use O_C code in your products, the licenses permit you to do so, but they also impose some additional duties on you:

  • the GPLv3 license requires you to release, also under the GPLv3 or some other compatible open-source license, all the source code for any module in which you have used GPLv3-licensed O_C code
  • the MIT license requires you to include the various copyright notices in the O_C source code headers and the MIT license permission notice in all copies or substantial portions of “the Software”. The “Software” includes any binaries compiled from code which includes any O+C source code i.e. the firmware flashed to module MPUs. Therefore, these copyright assertions and permission notices must be included in any manual or other documentation for your module, including printed documentation provided with the module.

If you cannot comply with these licensing requirements, then please do not re-use O_C code in your products.


The o_C build guides, the firmware user manual and associated documentation files are not licensed under any open-source or Creative Commons license. Copyright is asserted on them and third parties are thus not permitted to copy or re-publish the material. DIY builders and end-users are welcome to make copies of the documentation in other formats, such as PDF files, although for personal use only.