Centropy, founded in January 1999, was a warez group which specialized in the unauthorized sharing of films. Touting many "0-day" and "negative day" releases, Centropy has released and pre-released numerous films. They primarily release DVD-Rips, Telesyncs and Screeners. They've added logos for bragging rights to their releases.
Centropy was a target of Operation Site Down, a major raid conducted by the FBI and other law enforcement agencies on June 29, 2005.
References
Centropy Wikipedia(Text) CC BY-SA