you'd be impressed by the amount of snake oil sold in the ad world.
for the latest ones, see the 'solutions' for viewability (i.e. another way to try to not pay publishers for displayed ads). they are all a joke that work on less than 1% of the cases you see in the wild. Yet, no mention of that is made.
When you see "proprietary", "patented", assume "BS".
now, answering your question, this is pretty much a mix of auto/manual monitoring. So with very little effectiveness. And/OR the publishers in question serve the page with Script tags, so they have access to the referrer of the original content page.
for the latest ones, see the 'solutions' for viewability (i.e. another way to try to not pay publishers for displayed ads). they are all a joke that work on less than 1% of the cases you see in the wild. Yet, no mention of that is made.
When you see "proprietary", "patented", assume "BS".
now, answering your question, this is pretty much a mix of auto/manual monitoring. So with very little effectiveness. And/OR the publishers in question serve the page with Script tags, so they have access to the referrer of the original content page.