Yes it was developed by Spektrum for JR as the Japanese authorities weren't hoodwinked into allowing it full 100 mW power level. In Japan DSM2 is only allowed 10 mW, now as Horizon/Spektrum "forced" JR into DSM (JR were developing their own 2.4 GHz offering quite a few years ago) it was only right that they stepped up and sorted out a hopping system for JR users in Japan.

Now the shackles are off, JR have released their own ( and quite probably their original design) system known as DMSS.