One of the things that Blackhat SEO types do is they attempt to scrape other people’s sites that have original content. Then they post that content on their site as their own, attempting to raise their own page-rank. Because the search engines aren’t smart enough to know who is the original author, the sploggers get higher in the page ranks.
One of the tactics to evade them is to deliver unique content to them (a one time token or something of the like) that allows them to see the content, but if they attempt to replay it, the webmaster can tell who it is by going to their lookup table and seeing who scraped them.
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