https://www.theregister.co.uk/2018/04/05/blackberry_sues_snapchat_for_infringement/

BlackBerry has filed suit against Snap Inc alleging the Snapchat service copied half a dozen of its mobile app design patents.

The one-time smartphone king continued its efforts to cash in on its patent portfolio Tuesday when it filed a complaint [PDF] in the Central California US District Court accusing Snap of stealing its patented designs for the layout, alert, and messaging functions within mobile apps.