Canon’s RF mount is what is known as a closed system, which is to say that at the time of publication, Canon won’t allow any other manufacturer to make electronically connected, or “active,” RF lenses for its mirrorless mount. That situation recently revealed itself when Viltrox said it was told to stop manufacturing RF lenses that it had reverse-engineered by Canon’s legal team.
Source: RED Uses the RF Mount, So Why Won’t Canon License it for Lenses? | PetaPixel