I hope you'll agree that it's a very, very different situation if a teacher makes 30 photocopies of 1 page of a 300-page book, vs. if he makes 30 photocopies of

I hope you'll agree that it's a very, very different situation if a teacher makes 30 photocopies of 1 page of a 300-page book, vs. if he makes 30 photocopies of a 1-page poster, with intent to distribute those to students. It is perfectly plausible that the original comment, in referring to "material" was implying the former, but it made no distinction about the latter, and the devil's in the details, as they say.