Earlier this year, Liberty Access Technologies Licensing LLC revived litigation over a portfolio of patents generally related to an “access device” for activating a door lock when a “current reservation certificate has been presented”. In 2018, the Empire IP LLC plaintiff, as exclusive licensee, had sued Hilton over its Digital Key, a tool for opening a hotel room door with a mobile device. That case ended within months of filing, the campaign going silent until earlier this year when Liberty Access sued Marriott in the Eastern District of Texas. Now, the plaintiff has added a second active case, hitting ASSA ABLOY (2:22-cv-00507) in the same district over the same three patents.