The scratch-reveal petals are cut from "Rose petal on wooded desk - 1.jpeg" by Sankar 1995, licensed under Creative Commons Attribution-ShareAlike 3.0 Unported.
Changes: the photographed petal was cropped, its desk background removed, resized, mirrored in alternate copies, and animated. The adapted petal images are available under the same CC BY-SA 3.0 license: petal image and mirrored image. This license applies to these petal assets, not the couple's photographs or other invitation material.
