1 Additional Grant of Patent Rights Version 2

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     3 "Software" means the Zstandard software distributed by Facebook, Inc.

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     5 Facebook, Inc. ("Facebook") hereby grants to each recipient of the Software

     6 ("you") a perpetual, worldwide, royalty-free, non-exclusive, irrevocable

     7 (subject to the termination provision below) license under any Necessary

     8 Claims, to make, have made, use, sell, offer to sell, import, and otherwise

     9 transfer the Software. For avoidance of doubt, no license is granted under

    10 Facebook’s rights in any patent claims that are infringed by (i) modifications

    11 to the Software made by you or any third party or (ii) the Software in

    12 combination with any software or other technology.

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    14 The license granted hereunder will terminate, automatically and without notice,

    15 if you (or any of your subsidiaries, corporate affiliates or agents) initiate

    16 directly or indirectly, or take a direct financial interest in, any Patent

    17 Assertion: (i) against Facebook or any of its subsidiaries or corporate

    18 affiliates, (ii) against any party if such Patent Assertion arises in whole or

    19 in part from any software, technology, product or service of Facebook or any of

    20 its subsidiaries or corporate affiliates, or (iii) against any party relating

    21 to the Software. Notwithstanding the foregoing, if Facebook or any of its

    22 subsidiaries or corporate affiliates files a lawsuit alleging patent

    23 infringement against you in the first instance, and you respond by filing a

    24 patent infringement counterclaim in that lawsuit against that party that is

    25 unrelated to the Software, the license granted hereunder will not terminate

    26 under section (i) of this paragraph due to such counterclaim.

    27 

    28 A "Necessary Claim" is a claim of a patent owned by Facebook that is

    29 necessarily infringed by the Software standing alone.

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    31 A "Patent Assertion" is any lawsuit or other action alleging direct, indirect,

    32 or contributory infringement or inducement to infringe any patent, including a

    33 cross-claim or counterclaim.