Unless specifically stated to the contrary, the material on this blog is published by Kees Wiebering under Creative Commons Attribution-ShareAlike International license CC-BY-SA 4.0.
All of the work can be used, reproduced and quoted and changed for without my permission, for commercial and non-commercial use under the condition that you attribute it to the author and share it under the same license.
For co-authors and in specific cases, licenses may be different on a per-post basis, which will then be mentioned in the blog post itself.