Yahoo uses elaborate filtering techniques to identify who users are and those providing auction goods. All (Yahoo) auctions can be searched by keywords and you can get the site to alert you to specific keywords as buying opportunities emerge.
We've asked Yahoo to use their filtering to prevent piracy, not for profit. We tried to discuss it with Yahoo.
The lawsuit seeks an injunction against Yahoo to prevent the auction or sale of counterfeit games and illegal devices designed to circumvent copyright protection.