Apache2 license 第三部分 Grant of Patent License 是什么意思有朋友懂吗？

https://www.apache.org/licenses/LICENSE-2.0， 第三部分

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.

有英文非常好或者了解的朋友能解释一下吗？
再贴一个知乎相关问题链接（感觉没说明白）：
https://www.zhihu.com/question/65637842