This was probably answered way back when. Long before I started dealing with DJI's, but I'd really like to know. I've been around a while. There used to only be a handful of TX/RX protocols (JR, Futaba, Air-something, etc.). Often copied, but never really anything new and original. Does anybody know for sure that the DJI (and Yuneec for that matter) protocols are proprietary? I'm sure they are because everybody would be flying JR or Futaba TX's if they weren't, but I'd love to hear the answers. I'm sure somebody's been down this road long before me. I'd just love to hear what they found.