One year after ContentGuard, a subsidiary of Pendrell, filed its first litigation, the entity filed a new suit against Amazon, Apple, BlackBerry, Huawei, and Motorola Mobility. Nine patents related to rights management for digital content are asserted in the case (6,963,859; 7,225,160; 7,269,576; 7,523,072; 7,774,280; 8,001,053; 8,370,956; 8,393,007; 8,583,556). Four of the patents in suit were asserted in ContentGuard’s previous litigation against ZTE. That case, filed in February 2012, recently concluded when ContentGuard voluntarily dismissed the defendant without prejudice. In the current lawsuit, Amazon’s Kindle app is accusing of infringing the patents-in-suit based on its digital rights management solution. The other defendants are joined in the action because they provide access to the Kindle app on their mobile devices. ContentGuard was spun out of Xerox Parc in 2000 and then acquired by Pendrell in 2011.  12/18, Eastern District of Texas, 2:13cv01112