There is an editor Draft.js. It's licensed under the BSD-style License. Every file in the source code has a copyright notice. Here is a piece of that notice:
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
So does that text says that PATENTS should be included in a build?
For example, there is a build folder: