WooCommerce Watermark plugin allows you to secure your product images with a watermark. You can either add text or image watermark whichever suits your business requirements. Create rules to specify products or select a whole category to automatically apply watermarks.
Demo https://codecanyon.net/item/woocommerce-product-image-watermark-plugin/20846672
Downloadhttps://www.filecad.com/mnl0/WooCommerce-Product-Image-Watermark-Plugin-v1.0.2.rar