“[a] prerequisite for the existence of effective search engines is the freedom to crawl and index the information available on the Web. The filtering and blocking of Internet content by search engine providers entail the risk of violation of freedom of expression guaranteed by Article 10 of the Convention in respect to the rights of providers and users to distribute and access information. Search engine providers should not be obliged to monitor their networks and services proactively in order to detect possibly illegal content, nor should they conduct any ex ante filtering or blocking activity, unless mandated by court order or by a competent authority. However, there may be legitimate requests to remove specific sources from their index, for example in cases where other rights outweigh the right to freedom of expression and information; the right to information cannot be understood as extending the access to content beyond the intention of the person who exercises her or his freedom of expression.”
