The reason why Douyin's live broadcast displays a private protection room is because the host has set up private protection before the live broadcast, and only specific viewers can enter the room to watch. This setting can be made before entering the live broadcast room, and it can also be set up inside the live broadcast room. Such a setting can protect the host's privacy and prevent bad viewers from entering, ensuring the quality and security of the live broadcast. With the continuous deepening of online communication, private protection settings have become more and more common. For some specific occasions, such as private gatherings, business meetings, etc., it is necessary to restrict participants. At this time, private protection settings are very important. In the future, with the continuous development and improvement of technology, private protection settings will become more and more intelligent and precise, bringing users a more convenient and safe experience.