On the videos I checked they are all using the same CDN. So I would block that. Not sure if that will also change every day, but it is worth a shot. Also it seems like the service won't work without authenticating, when doing that it is doing it via the same primary domain (4kmovies.online) I would assume changing domains daily with DNS propagation and changing the location of the authentication service everyday has to be time consuming. Also IP range they are currently using is 104.31.77.0-104.31.77.255 and located in Chicago behind Cloudflare. I thought maybe you could try a block from a country outside if yours, but looks like that won't work. cdn.4kmovies.online
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