rxmd
May contain traces of nut
I don't see why Fuji could not make a M-mount camera, hypothetically. Cosina make M-mount cameras and I don't think they pay anything to Leica. Ricoh just made a M-mount module and they don't pay anything. So why would Fuji?
Sevo's argument was about parallax correction and framelines in a hybrid viewfinder. For that to work well, the camera needs to know the specifics of the lens. On that, Leica has patents.
The three-position encoding used for selecting framelines is available patent-free, but under that a 35 and a 135, or a 28 and a 90, are encoded identically in spite of behaving substantially differently. Given how people complained about lack of autofocus precision close up on the X100, it is reasonable to assume that they will complain about a lack of framing precision, too.
The GXR M-mount module is unconcerned with framing, so they don't have to bother.