Off the top of my head big users of React include:
* Apple (their entire dev docs site is built in it, and they've hosted Bay Area React user meet-ups)
* Twitter (for their mobile web)
* Microsoft (parts of Visual Studio use it)
* Netflix (all over their frontend stack)
...as well as Dropbox, AirBnb, Venmo...
So whilst I don't doubt you've discussed it with concerned counsel, there are huge corporations deploying React today, many of whom have extensive experience dealing with patent and IP issues (Apple, Microsoft, etc).
* Apple (their entire dev docs site is built in it, and they've hosted Bay Area React user meet-ups)
* Twitter (for their mobile web)
* Microsoft (parts of Visual Studio use it)
* Netflix (all over their frontend stack)
...as well as Dropbox, AirBnb, Venmo...
So whilst I don't doubt you've discussed it with concerned counsel, there are huge corporations deploying React today, many of whom have extensive experience dealing with patent and IP issues (Apple, Microsoft, etc).