Few camera manufactures if any, are large enough to produce all of the ICs used in a product. The Sensor, and processor, being most important are often produced by the Big guys. Nikon is rumored to be making their own sensors currently. All of this electronics rely on chips produced by others. The world is full of knockoffs. It's true in the electronics world too. Forgeries are common and cost makers of electronics products much grief. Have a look at the article and search for many others if you're interested. Many of us have had this trouble and it comes to a trace of custody from the maker to the buyer. It's a very serious problem. Don't blame Leica..
http://www.popularmechanics.com/technology/gadgets/news/4253628