Microsoft, Nintendo, Sony and Valve have been sued for patent infringement over two patents relating to purchasing products relating to games. The suit, filed by Olympic Developments AG, LLC, involves US Patents 5,475, 585 ("Transactional Processing System") and 6,246,400 ("Device for Controlling Remote Interactive Receiver"). The '585 patent was issued way back in 1995 and the 400 patent in 2001.
We will monitor the case. Check back for significant developments.