My photos by topic
"Free" means: Contents free of charge, but protected by copyright laws.
My photos published at Wikimedia are licensed under a Creative Commons (CC) License. This means, you may use these photos free of charge, but for a little immaterial equivalent. Attribute author and license.
If you'd like to use one of these images, please use it simply and without difficulty according to the terms of the license without any further requests.
Images licensed under CC-BY-SA may be used commercially under that license. Other rights like i.e. personality rights or trademark rights still have to be respected.