Voigtlander = member of the Rebel Alliance, a member representing the light side, along with Canon, Nikon, Contax, etc...
Leica = Dark Side - they initially had great intentions, but as Canon and Nikon grew in power, Leica started to equate that price = power, and fragmented themselves into a small faction hoping to control Photo Empire with their philosophies and ancient powers.
Although the Rebels really do belong to Canon (part of the Rebel Alliance, as someone suggested above), they are just a a small fragment of a larger body that are loyal to the cause... err... um... yeah... something like that.