Houses are physical objects. If you take it someone else has to lose it. E-Books are digital objects. You can have infinitely many copies of them without anyone losing anything.

And yes, DRM infringes on essential rights, it not only limits what you can do with something you supposedly bought, but takes away your control over your own hardware.

And even more basic is the right not to get frauded. If someone claims to be selling something to you, but then they only give you locked down, perhaps even revokable access to it, then they are defrauding you.