LICENSE.txt

CC BY-NC 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/)

Copyright (c) Facebook, Inc. and its affiliates.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this material, to copy and redistribute the material in any medium or format,
and to remix, transform, and build upon the material subject to the following 
conditions:

- Attribution: You must give appropriate credit, provide a link to the license, 
and indicate if changes were made. You may do so in any reasonable manner, 
but not in any way that suggests the licensor endorses you or your use.

- NonCommercial: You may not use the material for commercial purposes.

- No additional restrictions: You may not apply legal terms or technological 
measures that legally restrict others from doing anything the license permits.

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE MATERIAL IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
MATERIAL.