Anybody know how to download books from Internet Archive without having to return them?

I was able to download some textbooks a while back but they never stayed permanent and I guess had some sort of DRM that made them expire after 14 days.

anybody have any way to get around that and download books from the Internet archive to keep permanently without issue?

I would just use one of the other download sites listed in the megathread but none of them have the book that I'm looking for. TIA