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Google has issued a black list of URLs of Web sites that may have malicious programs. Developers can incorporate the API (application programming interface) into their applications that deal with user-generated links.

Some sites are created computers with malware and spread links to those sites in forums and through spam, among other methods.Google is well known with its moves of late in the security field.

According to Google the API is experimental and they expect to change the protocol over time to improve the service.
The client application can use the API to download an encrypted table for local, client-side lookups of URLs that you would like to check.

Google also advised that developers may only warn users about a particular site if your application has checked with Google for a list update within the past 30 minutes and confirmed that the URL is on the updated list.

Google's blacklist is used in the Firefox browser as well as Google Desktop, the company's desktop search application.