Creative Commons is one of he most popular kind of licenses now days, the idea of collaboration and sharing knowledge is the beginning of a new culture of development.


One of the licenses they provide is the attribution 4.0 international, this allows people to share and adapt but they have to give credit to the creator.


Other license is the Attribution NonCommercial 4.0, this license also allows people to share and adapt they also have to give credit to the creator but commercial use is prohibited.


I would choose the attribution NonCommercial 4.0, as precious plastics project is  open source I believe any project that modifies it or make some improvements should still open source and non commercial. To spread the modifications and improvements made I will upload the files into the precious plastics blog where the community can use them freely.


Precious plastics forums https://davehakkens.nl/community/forums/forum/precious-plastic/


Creative commons web https://creativecommons.org/choose/