The checksum is clearly not enough in this case, so EU administering bodies would have to set up a really sophisticated system - and in countries where getting even an appointment date to the social healthcare system is nigh impossible I see literally zero chance for such a backend (so everyone's on their own).
In this case what's happening here is that we are killing the internet as we know it (or knew it five years ago). Government bodies most of the time are incompetent in IT (unless they have an ulterior motive, like large scale censorship or surveillance), so you're probably better off relying the giants' service and create a facebook page, or a google doc, instead of building something on your own (creating a gray net).
There are many worst case scenarios with this law. Facebook and Google creating a new Internet, government bodies setting up "copyright servers" (with advanced data mining capabilites), link tax rendering hyperlinks feared, extortion schemes by shady organizations and lawyers, implementation tax for software development, fear of innovations et cetera.