A license is required for each stream coming from a video encoder or a multi-sensor camera.
Video encoders usually output each channel separately, and these channels are added to Obseron as separate cameras.
There are different kinds of multi-sensor cameras. Some cameras output each sensor as a separate stream and some cameras will stitch multiple images and output it as a single stream. In case there is only one stream, it will require a single camera license. If all the sensors are separate streams, each will require its own license.