It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
This image was acquired from
Keywords from Image Description:
sunset evening evening sky eveningsky dusk yellow orange sunset sky sunsetsky clouds silhouette skyline trees skyline treesskyline public domain dedication publicdomaindedication mabelamber
Page 2017 Free-images.com. All images are Public Domain