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Says public domain in the post but all the code says Apache, weird~

Article author probably doesn't realize there's a distinction between "publicly available" and "public domain"

Article author is probably a lawyer (or at least proof-read by a lawyer), so that sounds strange.

German law doesn't have a public domain, so Apache license is as close as you can get.

Why wouldn't MIT or BSD License be closer?

Apache2 has an explicit patent license.