If, for example, someone repackaged a public domain font without attributing source, I wouldn't call that plagiarism either. In my definition of plagiarism it

If, for example, someone repackaged a public domain font without attributing source, I wouldn't call that plagiarism either. In my definition of plagiarism it implies unauthorized use (i.e. not complying with the license) but I guess that's open to interpretation. So it'd still be uninteresting, unimaginative, not original work... but not plagiarism.