Milestone XProtect Essential Camera License to connect to a camera. A license per camera channel is required. In total, for all copies of the product installed under this license, the product may only be used with as many cameras as you have purchased camera licenses for. Video encoders connected to multiple analog cameras require a camera license per channel to operate. I/O devices require a camera license per I/O device. Up to 26 camera licenses can be purchased per SLC. To extend the installation with additional camera licenses, the SLC is required when ordering.