I don't think that's the case. If material is copyrighted or trademarked, then you must ask permission before using the material. If it's just written by somebody else with no copyright, it's still legal to use the material as long as it's credited.
But usually, these things are copyrighted.
I'm not 100% sure, I'm only a high school law-subject student. We did this last year, but I can't remember.
Erwin would know this better than I do.
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