DRM is just a thing that authors choose to put into their media. The fact that they do it because enforcing copyright via legal channels is unrealistic is effectively incidental.
If anything, what is necessary to achieve the objective is putting limits on what authors are allowed to put inside of the media they are producing, which is a heck of a can of worms in of itself that I think zealous preservation advocates are a bit too eager to brush off.
With always-on-DRMs, server-based multiplayer service games, and even things like exclusive streaming-only video games, even having access to the data required to run what you purchased can be literally impossible.
DRM is a whole different kettle of fish that I agree also needs to be solved with all media forms.