Easy peasy. Is plagiarism theft according to halacha, does intellectual property actually exist in halacha, and does it fall under the umbrella of dina d'malchusa dina?
Everyone can decide for themselves the ethics-
But I just want to say that
I know someone that asked a very big posek in israel about this (as he asked my wife to write a report for him for college, and we were not so into it so I said only if he asks a rav) and was told it's ok.
(And I even confirmed it with the Talmud of that rav that is the one that asked him the question).
I am not here to explain the psak (as I am not a posek on these things), just saying...