Leading search engine companies Google and Microsoft have agreed measures to make it harder to find child abuse images online.
As many as 100,000 search terms will now return no results that find illegal material, and will trigger warnings that child abuse imagery is illegal.
PM David Cameron has welcomed the move but said it must be delivered or he would bring forward new legislation.
Child protection experts have warned most images are on hidden networks.
In July, Mr Cameron called on Google and Microsoft's Bing - which together account for 95% of search traffic - to do more to prevent people getting access to illegal images.
He said that they needed to ensure that searches which were unambiguously aimed at finding illegal images should return no results.
New software
Now both companies have introduced new algorithms [software instructions] that will prevent searches for child abuse imagery delivering results that could lead to such material.
Full story:
http://www.bbc.co.uk/news/uk-24980765