Abstract: A digital data processing method obtains an authorization level of a connected client device. The method further searches for available digital data to be browsed corresponding to the obtained authorization level and transmits parameters of the available digital data to the connected client device. The method further determines whether the connected client device has authorization to process specified digital data selected from the available digital data when a processing command is received. If the connected client device has authorization to process the specified digital data, the method transmits the specified digital data to the connected client device.

Abstract: An image monitoring and broadcasting method is executed by a first electronic device. A user interface of the first electronic device is displayed. When a monitoring or a broadcasting command is received from the user interface, the method acquires connection information of the second electronic devices which have been connected to the server. If the monitoring command is received, the method transmits connection information of the first electronic device and a preset monitoring notice to the second electronic devices, receives images transmitted from the second electronic devices to be displayed on the user interface. If the broadcasting command is received, the method transmits a preset broadcasting notice images displayed on the first display screen to the second electronic devices.

Abstract: A roll-call processing method is executed by a server. The method records first connection information of a first electronic device and transmits a roll-call interface to the first electronic device when the server receives a request for the roll-call interface from the first electronic device. The method further records second connection information of at least one second electronic device and receives a photo transmitted from the second electronic device. The method transmits the received photo of the second electronic device to the first electronic device to display the received photo on the roll-call interface of the first electronic device.