In Germany, this is defined in § 95a UrhG [0], as in "bypassing safeguard measures to gain access to copyright material". "Anti-Anti-Adblocks", as in Adblock filters bypassing adblock popups, were already declared illegal in the BILD case [1].
[0] https://dejure.org/gesetze/UrhG/95a.html
[1] https://www.wbs-law.de/it-recht/verbreitung-einer-anleitung-...