BlackBerry Ltd has filed a patent infringement lawsuit against Facebook and its companies WhatsApp and Instagram for improperly implementing BBM IP in the social network's messaging apps. While BlackBerry is seeking to protect the interests of its shareholders, Facebook is not in a mood to give up and is ready to challenge the suit in court.
https://www.notebookcheck.net/BlackBerry-sues-Facebook-WhatsApp-and-Instagram-for-copyright-infringement.287548.0.html