BlackBerry Limited, the enterprise software arm of the Canadian company that used to sell smartphones, filed a lawsuit today against Facebook, alleging that the social network and its WhatsApp and Instagram subsidiaries infringe on BlackBerry messaging app patents. The core of BlackBerry’s complaint, which is a , is that the company’s proprietary and patent-protected messaging product BlackBerry Messenger, known colloquially as BBM, was a cornerstone of modern mobile communications.

BlackBerry is now contending that its intellectual property has been infringed upon by Facebook’s “using a number of the innovative security, user interface, and functionality enhancing features that made BlackBerry’s products such a…

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