For perfomance reasons we use Cloudflare as a CDN network. This saves a cookie "__cfduid" to apply security settings on a per-client basis. This cookie is strictly necessary for Cloudflare's security features and cannot be turned off.
We embed videos from YouTube. Cookies are set in order to: estimate the users' bandwidth on pages with integrated videos, registers a unique ID to keep statistics of what videos from YouTube the user has seen, stores the user's video player preferences using embedded YouTube videos