The search engines are motivated to deliver value so they need to be able to ensure high quality appropriate content for each and every search request.

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We understand that Twitter has an obligation to comply with legal requests that do not violate human rights, and we appreciate that you are taking steps to minimize the impact of censorship, by, for example, making censored content available outside the country where it is withheld, only censoring content in response to a government request, and providing notice when a tweet is censored.

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The rest are automatic, such as clicking a pre-configured link or having the browser execute request within a web page (for example, requests to call images and additional content from third party sites).

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The law allows Web sites to host infringing content if they're not purposefully profiting from it and if they remove it at the copyright holder's request.

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Google and YouTube did not respond immediately to a request seeking information on its plan to match ads to copyrighted content, but McQuivey said YouTube hasn't signed up a major content provider yet.

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