Actually, no. Plagiarism is independent of any license. I can't distribute copies of War and Peace and claim I wrote it, and it's not because Tolstoy attached a license. One can plagiarize even if no money is involved, or if the material has no explicit usage instructions.
This is a much easier fix for Medievia, by the way. Unlike rewriting the code from scratch, crediting the DIKU authors for the work they did would take minutes of your time.
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