Google Analytics is a web analytics service provided by Google, Inc. ("Google"). For further information go to Impressum > Google Analytics / Datenschutz. Furthermore you can prevent Google's collection and use of data (cookies and IP address) by downloading and installing the browser plug-in available under: tools.google.com/dlpage/gaoptout?hl=en .
You can refuse the use of Google Analytics by clicking on the following link: Disable Google Analytics. An opt-out cookie will be set on the computer/smart device, which prevents the future collection of your data.