I, Markus Winkler, have published this photo under the terms of the license CC BY which allows you to:
Freely use and distribute it for non-commercial or for commercial purposes
Under this condition:
Credit me as author and link back to my website. To do so add "Markus Winkler, markuswinkler.de, License CC-BY" good legible next to the image.
Licensing
I, the copyright holder of this work, hereby publish it under the following license:
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
https://creativecommons.org/licenses/by/4.0CC BY 4.0 Creative Commons Attribution 4.0 truetrue
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