I would cite all regulations, but I know you will simply ignore it. Here you will find the human-readable license for content of the Universaldenker world. If you want to use images, videos and other content, you have to respect the license.
You are free to...
Share — copy and redistribute the content in any medium or format.
Adapt — remix, transform, and build upon the content
for any purpose, even commercially.
Under the following terms...
Attribution — you must give appropriate credit, provide a link to the material or to this license.
No additional restrictions — You may not apply legal terms that legally restrict others from doing anything the license permits.