Ok so that's a cryptic question. But I have 4000 images on my site, high resolution ones that I odn't want to stop them from being pinned, but I'd like there to be some script that would apply a watermark before the pin hits the site.

Is this available or is such a thing possible?

I know Pinterest have applied a feature that allows you to stop pinner pinning, but I'd like them to do so but with a watermark applied.