Name: Valve Software
28DE is Valve's official vendor ID, confirmed by Valve here:
https://steamcommunity.com/app/358720/discussions/0/517141882716368260/#c517141882716908605
My SC radio receiver identifies itself as 28DE:1142 "Valve Software" / "Steam Controller"; the controller itself connected over USB identifies as 28DE:1102 "Valve Software" / "Wired Controller".
2017-01-30 18:11:33