 The first cause of action alleged Blockbuster's infringement of U.S. Patent No.7,024,381 (issued April 4, 2006; only hours before the lawsuit was filed) by copying the "dynamic queue" of DVDs available for each customer, Netflix's method of using the ranked preferences in the queue to send DVDs to subscribers, and Netflix's method permitting the queue to be updated and reordered.The second cause of action alleged infringement of Patent No.