Nintendo Co. Ltd and Nintendo of America are both among a number of parties being sued for alleged patent infringement by Secure Axcess, a company that is "dedicated to monetization and management of Internet security patents."
The patent (which you can see here, if you're interested in the legalese) in question was issued to Secure Axcess in February 2003 and covers "a computer providing multiple display capability where one display presents the current document and another display may show a true display of a previously opened document." In other words, a computer that shows information on more than one screen, like the Wii U with its game pad.
Retailers are also being sued for selling the Wii U without a license, and Secure Axcess is hoping to win compensatory damages, costs, and other relief.
In the past, Nintendo has been sued in other infringement cases, such as one case for the 3D technology in the 3DS. Nintendo now pays royalties for each handheld sold. In 2013, Nintendo won a lawsuit claiming that the Wii Balance Board violated a patent.
This isn't the first time Secure Axcess has attempted to sue Nintendo for allegedly infringing this same patent. In January, Nintendo was summoned for the same patent, except with the Nintendo DS, DS Lite, DSi, 3DS, and 3DS XL.
[via Nintendo World Report]