Nintendo filed suit in the Tokyo District Court against several companies that sell DS flash cart units (R4 Revolution / CycloDS Evolution), which allow homebrew material but are also used to load pirated games. According to Japanese news service Nikkei Net, Nintendo did not fly solo, as it was joined by 54 other companies such as Capcom, JNH Co., Sega. SNK and Square Enix. While Nintendo has sold in excess of 70 million NDSes, it claims that piracy cost the company, and its partners, $1 billion in 2007.