- create a "robots.txt" file on your web site to prevent our crawler from indexing your site
- add a "noindex" meta tag to your documents
- remove the original document from your web site
- host the document on a secure section of your web site (HTTPS or login)
But the old URL may always remain in the index, due to the fact that there are links to that URL as a reference. "Under most circumstances, Yahoo! will not manually remove sites or pages from the index as we do not have the means to verify the validity and authority of each request."