<https://www.lhr-law.de/en/thema/copyright-law-2/protection-of-creative-commons-licenses/>
<http://schema.org/description>
"Photographers who license their work under a Creative Commons license have special claims, even if the realization of profits is not the primary intent. Photos that are protected by Creative Commons licenses must be treated accordingly by the user, for example by naming the author."
<https://www.lhr-law.de/en/thema/copyright-law-2/protection-of-creative-commons-licenses/>