OK, done reading? That's why this is terrible. Our economy is partially built on the principle that once you buy something, it's yours to do with as you see fit. There are still limits, like you can't buy a book then distribute copies of it, but in general it's yours to modify, hack, fold, spindle, and mutilate.
In this context, Lexmark is trying to say "you gave us your cash, but we still own the thing". No, screw that. Toyota doesn't have a say in what I do with our minivan. I can swap its engine with one from a Ferrari if I want, paint it neon orange, and reupholster it with frog skin. It's mine. I don't have to get their permission to modify it in any way I want. (Laws still apply, of course, but that's outside of Toyota's control.) Well, same with Lexmark: they give up the right to tell me I can't refill a toner cartridge when I buy it from them. At that moment, the transaction is finished. They have money; I have full ownership of the unit.