The site you look at is a product of the browser after it interpreted the HTML. While the HTML may be protected by copyright, whatever the browser makes of it i

The site you look at is a product of the browser after it interpreted the HTML. While the HTML may be protected by copyright, whatever the browser makes of it is not touched by said author copyright. The browser is free to manipulate it however it wants, and therefore the user is as well. This includes the free use of adblockers. JS just does not matter here as it also only manipulates HTML, CSS is just important for styling the HTML. That would be my guess without having read the decision. Also, no derivative work because there is no work that is published. You are always free to modify copyright protected work, publishing it is the problem. It seems like this would have been a second hurdle for Springer, but they got stopped before this important fact even came up. Utter defeat for the evil ones.