Legally binding is only the full legalcode. For a free usage I recommend to respect the following licence conditions:
1. Provide my name as given above: Michael Paetzold,
2. a copy of, or the URI for, the applicable license: https://creativecommons.org/licenses/by-sa/4.0/legalcode.de,
3. in the case of an adaptation, a credit identifying the use of the work in the adaptation.
This license and the rights granted hereunder will terminate automatically upon any breach by you of the terms of this license. Any of the above conditions can be waived if you get permission from the copyright holder. If you have questions or wish differing conditions or a higher resolution, please contact me through mailmichael-paetzold.de or my discussion page