Kotaku reports that "Christopher has filed a $5M class action lawsuit against Ubisoft for using Starforce DRM in their games." Here is an excerpt from the complaint filed on March 26, 2004:

"Starforce DRM can compromise Windows operating systems’ security. Any virus or trojan can control a computer by and through the StarForce DRM installed on the computer, despite the security measures taken in newer versions of Windows.

Users receive no notice that removing StarForce DRM is necessary to prevent possible security compromises on their computer systems. Worse, removal of a StarForce Title does not always remove StarForce DRM software."

I'm not sure why the complaint is against Ubisoft and not Starforce though.