Google and Microsoft are working to clear the internet of child pornography.
More than 200 Google workers have spent the past 3 months working on preventing child sex abuse content from appearing in its search results.
Google has also cleaned up results for more than 100,000 searches known to lead to child porn results.
Another 13,000 searches related to child porn will lead users to warnings, saying that child sex abuse is illegal, and offering advice on getting help.
Meanwhile, new Microsoft picture-detection technology is putting a unique identification mark on child porn content.
Then, all copies are immediately removed from the web.