On photos published to Google Street View, a mark added to each photo as it’s published. See Watermark behavior.
On photos saved with Snapshot or Download photo, a “Created on PANOCOOL” mark. See Snapshot.
Saving or downloading a photo depends on where you are:
In PanoCool Retouch, Export at the top right saves the edited photo. See Export.
In the Virtual Tour Studio editor, Share › Download photo saves a scene as a photo, and Share › Snapshot frames one for social media. See Download photo.