From: IGN Site: http://wii.ign.com/articles/911/911328p1.html
The claim comes from Hillcrest Labs, creators of motion sensing technology who filed a complaint against Nintendo this August.
It's now been taken up by the US's International Trade Commission, who have the power to remove Nintendo's console from the market should they be found guilty.
"Nintendo intends to vigorously defend this action," said Nintendo in a statement to Reuters.