A secure conferencing device operating in a host or a guest mode. In host mode, the secure conferencing device coupled to an interactive digital signage (IDS) device, grants conference control to a host computer of the IDS device. The secure conferencing device receives a guest control signal and a guest video stream from a guest device, where the secure conferencing device prevents the guest control signal from being communicated to the host computer, yet transmits the guest video stream to the host computer for display on the IDS device. In the guest mode, the secure conferencing device grants conference control to a guest device, enables the guest device to affect a component of the IDS device, but does not enable the guest device to communicate guest control signals to the host computer of the IDS device.