For the university wide regulations and guidelines on IT security, we refer to the web page of the IT security officer. On this page, you find a directory with the current versions of all security guidelines and circulars. Of relevance to all users are, in particular, the guidelines on IT Base Protection (in particular also its section 1.6 on the use of external communication systems), on the use of skype and cloud storage services, and the circular on the security of research data. Please take these regulations into due consideration.