README: License disclaimer

README.md

@@ -34,3 +34,20 @@ There are several ways to join the development effort, share your progress with
 We are using slack as a communication platform between interested parties. You can [request to join by filling this form](https://docs.google.com/forms/d/e/1FAIpQLSfcod-avpzWVmWj42_hW1v2mMSHm0DAGXHxVECFig2dnKHxGQ/viewform).
 
 This repository is also a good way to get involved. Please fill in an issue if you witnessed a bug in the software or hardware. If you are able, you can also join the development effort. Look through the [issues opened](https://github.com/PlanktonPlanet/PlanktonScope/labels/good%20first%20issue) and choose one that piques your interest. Let us know you want to work on it in the comments, we may even be able to guide your beginnings around the code.
+
+# License: Our work is fully open source
+
+Depending on the material they cover, different licenses apply to the files of this repository.
+
+If you make any change for your use, please fork this repository and publish your improvements. It will help others, and we can integrate those changes in this repository if needed.
+
+Also, all licenses are contaminating, if you want to use any of this material for a project that you cannot open-source, please contact us using Slack so we can see what can be done to help you and your project.
+
+## Hardware files
+All hardware files and documentation (everything in the `hardware` directory) is released under a [CERN-OHL-S-2.0 license](https://ohwr.org/cern_ohl_s_v2.txt).
+
+## Software source
+The source code (everything in the directories `flows` and `scripts`) is released under a [GPL-3.0 license](https://www.gnu.org/licenses/gpl-3.0.en.html).
+
+## Everything else (documentation, pictures, etc...)
+Everything else is released under a [Creative Commons CC-BY-SA license](https://creativecommons.org/licenses/by-sa/4.0/).