DRM is digital rights management, and I think Jacob meant this in the sense of how files on the blockchain will be protected against copyright infringement. That's actually a beautiful aspect of this, that blockchains can be used as a registry of ownership. This is what BlockAI (now binded.com/) is aiming to solve by letting artists register and timestamp their work. The only thing about this is it'll be possible to identify infringement of someone's digital work, but not necessarily enforce the takedown of said work. Obviously there is a solution to this problem... someone like you just hasn't thought of it yet!