LUXEMBOURG—Google’s YouTube won its latest copyright-infringement challenge after Europe’s top court said online platforms are not liable for users uploading unauthorised works unless the platforms failed to take quick action to remove or block access to the content. The case marks the latest development in a long-running battle between Europe’s $1 trillion creative industry and online platforms, with the former seeking redress for unauthorised works that are uploaded. It is also part of the wider debate on how much online platforms and social media should do to police the posting of unauthorised, illegal or hateful content, an issue that European Union regulators are targeting with tough new rules that could come into force next year. “As currently stands, operators of online platforms do not, in principle, themselves make a communication to the public of copyright-protected content illegally posted online by users of those platforms,” the EU Court of Justice said. …