Nobody argues about whether a home printer prints; they argue about what it costs to keep one alive. The inkjet printer is the textbook case of the razor-and-blades model: the machine is sold at or below cost to generate sales of proprietary cartridges, which is where the profit sits. The tactics used to defend that arrangement are documented - designing cartridges so that specific components can be patented, invoking the Digital Millennium Copyright Act to stop third parties reverse-engineering them, and, rather than merely displaying a warning, disabling the printer outright when a non-proprietary cartridge is inserted. In extreme cases the cost of replacing disposable ink or toner approaches the cost of buying new equipment with cartridges included, which is why a working printer can feel like a liability. It has been fought in court: in Lexmark International v. Static Control Components the Sixth Circuit held that circumventing Lexmark's cartridge lock does not violate the DMCA, while in August 2005 Lexmark won a separate case over box-wrap licence terms.