Slack is the latest defendant to be added to Smart Authentication IP LLC’s (SAIP’s) file-and-settle litigation campaign. SAIP, a subsidiary of Monument Patent Holdings, LLC, sued Slack on July 19, the same day that the NPE’s case against Autodesk was dismissed, apparently in light of a settlement. Slack is accused of infringing a patent (8,082,213) generally related to multifactor authentication of users using separate communication channels; the company’s two-factor authentication process that uses codes transmitted via text or an authentication app on a smartphone.