I feel like we both mean the same things here, and I'm using more extreme and evocative language about it, but we're literally on the same page. I know a lot, and I mean a lot about DRM, and it means both of what we say.

DRM is intended to limit who accesses the content, on what devices, and when. It does it through a number of mechanisms from accounts, to encryption and certs, to digital hashes and stored keys.

These companies that sell you access don't sell you a copy of the content though, they absolutely only sell access. You have no legal right to the content, no 'right of first sale' rights to resell, you really don't have rights to the content that are guaranteed, they can always, and I mean always legally revoke access to you, even though you paid, for any reason they want and you don't have legal recourse.