I read a lot of textbooks in DRM free eBook format lately, strictly for the weight. However, some of my books have licenses on them stating its a crime to even

I read a lot of textbooks in DRM free eBook format lately, strictly for the weight. However, some of my books have licenses on them stating its a crime to even create a copy and worded so poorly that even personal backups are illegal, and I certainly am not allowed to share them with family members, resell, or let somebody inherit it. Same for almost all of my DRM free audiobooks. I don't find this acceptable when it comes up.