HP (2:15-cv-00454), Office Depot (2:15-cv-00451), Staples (2:15-cv-00453), and Walgreen (2:15-cv-00452) were sued in CDR Printing LLC’s campaign. The Empire IP LLC subsidiary had previously filed only two suits, both of which were filed in July 2014 and are still open. CDR’s campaign asserts a single patent (7,271,929) that generally concerns creation and printing of electronic documents with dynamic content. Defendants’ formatting and printing services are at issue in the litigation.