No keys have been changed.
TLDR from what I've already written: Germany and Italy have PlayReady-only streams, but theres a widevine license URL that provides the keys using widevine of course instead of PlayReady.
UK has also Widevine officially enabled, so I don't see UK having even the possibility to fix this anytime soon (even if they change keys, someone will grab them again). But other countries can fix this issue within 24 hours.
Not to mention that change encryption keys takes literally 30 seconds :)
Widevine should be completely removed or atleast redesigned immediately, but that's not possible cause devices have burned certificates inside and broadcasters can't simply make their apps not working anymore on most of the devices.
Apparently Sky has something REALLY wrong inside to don't take any action against that. But that's not my business.
I've warned them and gave them also a LOT of other intel (not everything has been published in the articles), so enjoy the streams for free directly from their CDNs cause I don't see them taking any action in the near future.