What is Royalty Free?
Royalty Free is a term used to describe the right to use copyrighted material without the need to pay royalties for each use. Specifically, in photography it means the user (you) has the right to use the photo without too many restrictions after you have made a one time payment to the licensor (us). Put simply, this means thats once you have purchased a license, you may use the image in several projects without having to purchase additional licenses.
Royalty Free DOES NOT mean the images are free!