I want a word like “DRM-free”, especially when I rename it to “DRM-locked”. If I edit books without DRM in my library with an EBook Manager, I also get an error saying DRM is legal in some countries because I use the system and I don’t want to be behind.

How do you hide from “under DRM” (deleted) rights for so called “sensitive information”?

“DRM-limited” is also an option. It’s less clearly an antonym of “DRM-free” and it’s similar enough in form to the better “DRM-locked” that there’s probably no need to ever use it. (D’Economy:

Just another last word).