We got a DNS-based censorship law in Denmark ages ago. It was strictly for blocking child pornography. Today the list also includes: Unlicensed gambling sites, piracy, as well as a handful of sites that “doesn’t contain CSAM or other obviously illegal content” (old source, but nothing has really changed except probably the amount of websites on the list)
Censorship will never be limited to what it was first set in motion for. It is just too powerful and it is too tempting to not expand it to cover other “nuisances” a government or its lobbyists might have. If the barrier of entry is just adding a new string to a list, they’re gonna add that string to the list.
And if you want to circumvent it you just point your DNS to Quad9, Cloudflare, Google, or any of the DNS services that doesn’t implement the filter (including at least one Danish DNS service), so in essence it is pretty useless for the target groups it’s meant for.
You don’t need to copyright it. Everything is copyrighted by default. You can decide to relax your copyright protection if you want, but the © symbol isn’t some magic spell. The sign kinda makes it look like it works the other way.