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Whitey - 11:01 am on Nov 11, 2006 (gmt 0)
By it's more popular name, it's called a "302 hijack" of content and your PR, where Google can be made to think that the referring page is the original content. Potentially this can invoke a duplicate content filter on your site, but also lower your positioning in the SERP's behind the referring site. [webmasterworld.com...] Suggestions to getting this removed would be to tell the webmaster that they do not have your permission to hold such links, or if the site is subjected to malicious intent by spammers or unscrupulous SEO, inform Google to seek to have the site banned for SPAM. [edited by: Whitey at 11:02 am (utc) on Nov. 11, 2006]
Links pointing to your site through a "faulty" jump or tracking scripts, mistakedly using a 302 redirect from the referring web page to your site, could be creating duplicate content.