At least in torrenting communities a lot of these books come from book databases like OverDrive. Most public libraries give access to OverDrive and removing DRM is straightforward
> I think the most important piece here is that the virtual goods and digital economy that’s going to get built out, that that can be interoperable. It’s not just about you build an app or an experience that can work across our headset or someone else’s, I think it’s really important that basically if you have your avatar and your digital clothes and your digital tools and the experiences around that — I think being able to take that to other experiences that other people build, whether it’s on a platform that we’re building or not, is going to be really foundational and will unlock a lot of value if that’s a thing that we can do.
https://developers.yubico.com/Passkeys/Passkey_concepts/Sing...
I wouldn't be surprised if password managers implement sharing between users tho