I agree the law should be reconsidered, or at least, as you say, should address publishers's part in eg. maintaining and distributing SHA keys for works they claim, though we all know this can trivially be defeated by just recoding content. I also don't understand why concepts of other parts of the law (link previews of snippets from news, Wikipedia and StackOverflow being shown on SERP pages so users don't go to the original source) aren't integrated, when there are obvious, widely used, and readily available techniques for linking, annotations and HTML metadata, or why these two issues should belong in the same law. I guess it's just a profoundly incompetent law.

I'm still confused who is behind the push for this part of "copyright" reform. German party CDU they say (eg. the party of Ms Merkel) with their buddy/sponsor Axel Springer Verlag, but OTOH last year's equally flawed law for online platforms self-censoring was initiated by Heiko Maas, SPD, so the lack of public or parliamentary discussion smells like a hidden quid-pro-quo deal here to me. I'd really appreciate links to more balanced and comprehensive coverage; even netzpolitik.org coverage is too one-sided IMHO.

For video and music, at least, YouTube already has ContentID.

For the sake of the battle, however, I will save my pickyness for another time.