enigma1 - 1:20 pm on Feb 22, 2009 (gmt 0)

Ive seen a few websites get more savvy about this lately. They place a small one pixel image in their content so that the user does not see it, but when automatic scrapers grab it and it is pulled to the scraper content page, the full size is displayed....

Perhaps 1% of scrappers are real humans who use copy-n-paste but the rest are bots and automatically retrieve the page content.

Therefore bot retrieves page HTML content in $buf variable
then in a language like PHP
$buf = strip_tags($buf);
And there goes the image tag or any other html stuff. I hope you get the idea why none of these techniques have an effect.