Facebook explicitly states that if they sue you, you can respond with a counter claim and not lose the patent grant From their FAQ [1]: > [Q:] Does the additi

Facebook explicitly states that if they sue you, you can respond with a counter claim and not lose the patent grant From their FAQ [1]: > [Q:] Does the additional patent grant in the Facebook BSD+Patents license terminate if Facebook sues me for patent infringement first, and then I respond with a patent counterclaim against Facebook? > [A:] No, unless your patent counterclaim is related to Facebook's software licensed under the Facebook BSD+Patents license. [1] - https://code.facebook.com/pages/850928938376556 https://code.facebook.com/pages/850928938376556