An appeals court has upheld a lower court's ruling that Dish Networks' DVRs infringe on software patents held by TiVo. In a unanimous opinion (PDF) issued earlier today, the US Court of Appeals for the Federal Circuit upheld a district court jury's verdict that DVRs made by Dish Network infringed on patent 6,233,389 for a "multimedia time warping system." The court also remanded the verdict on hardware patent infringements back to the district court for further proceedings.