i dont think so Jeff, maybe licencing agreements but really i couldn't tell you.
If you search google or wherever, you'll see what i mean by affiliates using inkjet-cartridges-brother-canon.com etc, domains like that.
If they chose to "clamp" down, then there's another story i suppose.
But will be very difficult, IMO.
I just quickly put up a affiliate site on this, hopefully it will rank soon.. then will probably be able to command more, as i see it.
Dave