DINA's digital conference centre uses the open source programme BigBlueButton as an integrated video conferencing solution which is also frequently used in school and university contexts. The advantage of open source lies particularly in its (data) security as the programme code can be openly viewed and optimised by international IT experts. There is already a variety of manuals on the Internet for BigBlueButton describing its functions in detail. Nevertheless, we would like to highlight some features on the following pages that deserve special attention.