Apache2 seems to be talking only about suing regarding the patent related to the work in question:
> such license applies only to those patent claims licensable by such Contributor that are necessarily infringed by their Contribution(s) alone or by combination of their Contribution(s) with the Work to which such Contribution(s) was submitted.
Facebook's version applies if you sue Facebook for any patent assertion.
Say you have a startup in talks to being bought by Google. The are suing Facebook because Facebook stole their ad click fraud detection algorithm. Now they'd be an additional worry about that patent claim.
rdtsc|9 years ago
> such license applies only to those patent claims licensable by such Contributor that are necessarily infringed by their Contribution(s) alone or by combination of their Contribution(s) with the Work to which such Contribution(s) was submitted.
Facebook's version applies if you sue Facebook for any patent assertion.
Say you have a startup in talks to being bought by Google. The are suing Facebook because Facebook stole their ad click fraud detection algorithm. Now they'd be an additional worry about that patent claim.