I remember once at my old high school they had a digital version of the math textbook and a code since my school was too poor to buy physical books for everyone

I remember once at my old high school they had a digital version of the math textbook and a code since my school was too poor to buy physical books for everyone and they had to stay in class. I forget what publisher but the book would never load in Apple's preview, I think maybe due to it having a password or DRM? So they're are still probably rare reasons to install Adobe Reader on a Mac.