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Are you saying that they could not come after you for simply using React (even if you were to dispute the relevant patents in court), or just that there is no e

• matthewmacleod 12y ago
  Facebook cannot 'come after you' for using React if you have not accused them of patent infringement. They can 'come after you' iff you have accused them of that, and you are using their software in such a way that a parent of theirs is violated. It's pretty straightforward: - Facebook has released some open source software. In the case of React, it's under the BSD license. - You can use this software however you want, in accordance with the license. - In addition to granting you a license to use the software, Facebook has granted you a license to any patents they own that cover the software. - There is no enumeration or claim that any patents do cover the software. - Your license to use any hypothetical patent that does cover the software will be revoked if you make a claim—legal or otherwise—that Facebook has infringed any patent. - At that point, you will no longer have a license to use any patent that covers the software. - If you are subsequently using the software in a way that infringes one of their patents, Facebook would legitimately be able to claim patent infringement.