What is the difference between the "unactivated" and the "enterprise license" versions?

How many USB hubs service the 3 USB ports of the LattePanda 3 Delta. One apiece?

http://docs.lattepanda.com/... The three 3.2 USB ports list they can output 10 Gbs,5 Gbps, & 5 Gbps. Do the Delta’s three USB ports work in unison to process up to 20 Gbps total? Or is there only a single USB host limiting the three ports to less then 20Gbps?

Hi, is there an adaptor for the RS232 header to connect a traditional 9-pin serial port cable?