See the bullshit with John Deere.  If a farmer wants to use his tractor to do X, or he needs to make repair Y.....he fucking can't.  Not without paying an extra fee, or not without bringing it in to the dealer for some proprietary "process" that costs 10X what his repair in the field would cost.
 
	I grew up in a world where farmers and ranchers kept a whole shed of spare parts, bits and bobs that could be used to fashion spare parts or makeshift repairs, etc.  When something went wrong with a piece of equipment, the first place we went was the shed, to see if we could find something to use to fix it ourselves.  Now?  Get fucked.  You just breached the "license agreement" (that's right, you don't even fucking own the whole tractor, you just have a license to use some of its features), voided the warranty, etc. etc.
 
	Make a product.  Sell it at a fair price that provides a decent profit.  Buy that product.  Own that product.  Use it as you wish.  That model is fucking DEAD.