I’d like to create an image that states a website has been inspected and authorized by me and allow partner sites to display this image, but prevent others from displaying the image. I was thinking I could host the image and ask partners to pass a token in the src attribute. I could then look up the partner and check the referrer domain name matches my registry. However, can’t someone still download the image from a partner site and just serve it from there own server and defeat this? Any other ideas?
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You cannot stop someone from downloading an image.
You can put text in the image to say “click here to verify”, then have that popup a page on your site which verifies the IP of the referrer.