Synology Hardware Licensing for Synology DiskStation Camera - License - 4 Camera - Licence - 4 Camera Synology Surveillance Device License Packs are designed for expanding camera, I/O module, and access controllers set up on Synology Surveillance Station. By default, two device licenses1 are installed on a DiskStation or RackStation, and more default licenses are installed on an NVR2. Extra licenses can be purchased for additional surveillance devices according to business needs.