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European Union set to revise cookie law, admits cookie banners are annoying
(www.techspot.com)
This is a most excellent place for technology news and articles.
That sort of thing is stored in a cookie.
You don't need permission for that particular one, though, it's site functionality and the user can reasonably expect that that kind of thing gets remembered.
Lots of stuff doesn't need permission, when you're seeing a banner either you're dealing with someone clueless, or they want to track you. Or both, of course.