SystemUtils#getBestUniqueDeviceID is more of a monument to my thought process on the subject. A sketch at best of the real solution. But a null token on an agreed-upon "not-enough security available" situation is a good idea. I'm definitely for not putting in more and more edge cases because I'm really interested in is futureproofing the code against any more manufacturer slip-ups.  

I'll check with James when he gets back from Jersey on what the best option will be server-side. I say let's mark it as a low priority for now, though.