No special algorithms needed. Your browser just tells them where you are coming from.


https://developer.mozilla.org/de/doc...eaders/Referer (German, switching de to en will likely give the English version)

The reason is that many offers are ad financed so if you embed the image, the ads are not shown - so no revenue for the site. You can still make a link to the page itself.

If you have some money left, I recommend hosting the images by yourself on a VPS or web hosting because then you can only break it by yourself. This would require a computer BTW.