Siemens 6GK1721-1XG03-0AK0 industrial network software licence. Siemens 6GK1721-1XG03-0AK0 is an industrial network software licence in the SINEMA Remote Connect range. Siemens’ exact-order-number description: SINEMA RC client V3 OSD for 1 installation software, OSD / software download, license key for server, 3 languages (de, en,zh-CHS), Windows 10 Pro.