Non-practicing entity WhitServe has filed a lawsuit against Apple in the US District Court for Connecticut. The suit alleges that Apple is violating its patent relating to a system for "sequentially opening and displaying files in a directory" with the Quick Look feature built into OS X since 2007's "Leopard" release. WhitServe claims to be actively licensing the 2011 patent, and has suffered from Apple's willful infringement of its patent.