(CNBC) — BlackBerry is suing Facebook for patent infringement on its legacy messaging service, the company said Tuesday.

“[W]e have a strong claim that Facebook has infringed on our intellectual property, and after several years of dialogue, we also have an obligation to our shareholders to pursue appropriate legal remedies,” the company said in a release.

BlackBerry is claiming infringement on patents it holds covering message encryption, battery and message notifications and combining messaging with gaming, according to the lawsuit.

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