There’s no software patents in the EU, when it comes to codecs the only thing patentable would be hardware implementations and if you have one of those whoever produces your CPU/GPU already paid for a license. DVD region-locking is at least sus to the commission but they never went ahead with antitrust etc. stuff probably because the market became irrelevant, also, the industry was smart enough to make the whole of the EU a single region. DeCSS is more of a grey area and currently unsettled but a Finnish court judged it legal because the mechanism circumvented is not effective. That’s a legal, not technical, thing, they’re basically saying that it’s closer to “circumventing” a copy blocker by disabling autostart when inserting a CD into your computer than it is to circumventing by actual decryption, which makes sense as the scheme is weak AF. That said if the industry were to upgrade the scheme they nowadays might run into a different set of anti-trust issues. Generally speaking nobody, not even the industry, really seems to care as physical media is pretty much dead.