AFAIK, there isnt a way to stop users from doing a quicktime screen recording or taking screenshots. Even if you could, the attendees could easily take their phone out and take a picture or video of the screen. Not sure what kind of events they are hosting but it sounds confidential. An NDA agreement should be useful for them. If anyone else knows of any integrations or apps that could help with this, post them here. I am curious now as well. hope