Additional Grant of Patent Rights

"Software" means the Flow software distributed by Facebook, Inc.

Facebook hereby grants you a perpetual, worldwide, royalty-free, non-exclusive,

irrevocable (subject to the termination provision below) license under any

rights in any patent claims owned by Facebook, to make, have made, use, sell,

offer to sell, import, and otherwise transfer the Software. For avoidance of

doubt, no license is granted under Facebook's rights in any patent claims that

are infringed by (i) modifications to the Software made by you or a third party,

or (ii) the Software in combination with any software or other technology

provided by you or a third party.

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.