If you file, maintain, or voluntarily participate in any claim in a lawsuit
alleging direct or contributory patent infringement by any Covered Code, or
inducement of patent infringement by any Covered Code, then your rights under
this promise will automatically terminate.
The license granted hereunder will terminate, automatically and without notice,
for anyone that makes any claim (including by filing any lawsuit, assertion or
other action) alleging (a) direct, indirect, or contributory infringement or
inducement to infringe any patent: (i) by Facebook or any of its subsidiaries or
affiliates, whether or not such claim is related to the Software, (ii) by any
party if such claim arises in whole or in part from any software, product or
service of Facebook or any of its subsidiaries or affiliates, whether or not
such claim is related to the Software, or (iii) by any party relating to the
Software; or (b) that any right in any patent claim of Facebook is invalid or
unenforceable.
https://github.com/dotnet/corefx/blob/master/PATENTS.TXT :
If you file, maintain, or voluntarily participate in any claim in a lawsuit alleging direct or contributory patent infringement by any Covered Code, or inducement of patent infringement by any Covered Code, then your rights under this promise will automatically terminate.
vs
https://github.com/facebook/react/blob/master/PATENTS :
The license granted hereunder will terminate, automatically and without notice, for anyone that makes any claim (including by filing any lawsuit, assertion or other action) alleging (a) direct, indirect, or contributory infringement or inducement to infringe any patent: (i) by Facebook or any of its subsidiaries or affiliates, whether or not such claim is related to the Software, (ii) by any party if such claim arises in whole or in part from any software, product or service of Facebook or any of its subsidiaries or affiliates, whether or not such claim is related to the Software, or (iii) by any party relating to the Software; or (b) that any right in any patent claim of Facebook is invalid or unenforceable.