Yahoo sues Ad.com, alleging forgery to steal trademark

Yahoo is not suing over a broken contract; it's suing over a forged title document.

Yahoo's complaint does not turn on creative differences. It turns on the chain of title.

AdMedia, according to Yahoo, submitted a fraudulent assignment agreement to the USPTO. If the assignment registers, the record silently changes ownership of the Ad.com trademark.

Trademark registries work on paper trust. A forged instrument exploits that trust, and the legal system becomes the only mechanism to undo the record.

For domain owners the lesson is structural: a mark is only as safe as the title document behind it, and an assignment filing is a quiet attack surface.

The suit names Yahoo Ad Tech and Yahoo IP Holdings, which shows this is about protecting the asset itself, not just the brand's public face.