Patents are frequently used to protect hardware consoles from cloning. Though patents do not cover elements like the form and shape of a console, they can be used to protect the internal hardware and electronic components, as Magnavox had used at the onset of the arcade game and home console clones. Notably, many of the patents for the Famicom and NES expired in 2003 and 2005, respectively, leading to additional grey market hardware clones within a short time. However, Nintendo had built other intellectual property protection into their system, specifically the 10NES lock-out system, covered by copyright law, that would allow only authorized games to be played on their hardware.