change magnifier and lightbox image woocommerce

as I'm developing a stock photo site I don't want image theft. I have a watermark solution installed and all product images are watermarked except for the full size. This is the one for download...

WooCommerce PDF Watermark: Using custom order item meta data

I'm selling eBooks, and I'm capturing a name to license each eBook to with a custom field, because the eBooks are mostly bought by teachers on behalf of their students. Each eBook gets watermarked...