Creative commons (the original CC license symbols), the combined work by Shaddim and is hereby cc-by-4.0 licensed. https://creativecommons.org/about/downloads/ https://creativecommons.org/policies/

Creative commons license spectrum between public domain (top) and all rights reserved (bottom). Left side indicates the use-cases allowed, right side the license components. The dark green area indicates Free Cultural Works compatible licenses, the two green areas compatibility with the Remix culture. The bright green area alone can be seen as similar to the "fair use" concept, and the yellow area to the "freeware" concept.