You can record live lecture sessions if you want. Please note this is not a requirement, and you can decide yourself if you want to record lectures or not. 

To record a lecture, you must have selected “Enable recording for this conference” 1. Scheduling a conference. If you have not done so, simply end the session, edit the settings for the conference to enable this and launch it again.

To start recording, simply press the “Start Recording” button at top

This will bring up a popup which reminds you that you can press the record button again to pause recording. While a session is recording, you can press the button again to pause and resume recordings (this is useful if you are having technical difficulties - but be sure to remember to resume recording!).

Recording will stop when the conference ends.