Photo protection?

[JBRDiver]

This Lightbox is awesome! Is there any way to include an option to stop site visitors from 'dragging and dropping' photos displayed by the Lightbox onto their desktop? Maybe use some sort of transparent overlay? I'd already switched off the 'Save As' context menu that appears when they right click. As a photographer, I'd quite like to protect my photos from theft (I know they could just screen shot but every little helps). Thank you!!!!