IANAL. If we take a look at Apache 2.0's patent grant: > ... If You institute patent litigation against any entity (including a cross-claim or counterclaim in

IANAL. If we take a look at Apache 2.0's patent grant: > ... If You institute patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the Work or a Contribution incorporated within the Work constitutes direct or contributory patent infringement, then any patent licenses granted to You under this License for that Work shall terminate as of the date such litigation is filed. It seems to be more fair to me. It doesn't give any special right to Facebook or any other entity. I.e. Apache 2.0 revokes the patent grant if anybody sues for patent infringement arising out of the work. Facebook's license the patent grant if anybody sues Facebook for anything, or other parties for patent infringement arising out of the work.