I have lightbox plus and it appears non of the image protectors will prevent an image from being dragged from the lightbox to the desktop.
It does stop the image from being clicked on (prior to opening in the lightbox) and being dragged to the desktop.
I don't know if this is something the owner of lightbox plus also needs to be aware of and they all need to work together. Photocrati handles this by handing a html page to the requester and not an image. I'm hoping that we can find a solution here as I'd like the slightly higher level of protection..