Human Synthetic Intelligence

The synth (Synthetic Intelligences) are not truly a race, but instead a sentient computer system. The original files are kept locked down, as once copied, the personality and identity changes. 
Advanced synth are human in every right but their inorganic bodies. This allows them choice in their appearance and are the only ones that enjoy the same rights as an organic being would.  
They are currently only found on richer worlds where they can be produced, as there is no system in place for issuing travel licenses to artificial beings. The same reason exists for why they are not allowed to fight in the military.