French search engine 1PlusV is suing Google for 295m euros (£264m), the largest damage claim the search engine has faced in Europe.

It claims that Google used its market dominance to block the development of rival services.

An earlier complaint from 1PlusV and others, including Microsoft, triggered a European Commission investigation.

It also faces a probe from the US Federal Trade Commission.

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Google is now putting more focus on making sure their Ad implementation policies are strictly followed by all Web publishers. specially after noticing that some of the publishers are altering ad formats, behavior and targeting against Google policies.

These types of tampering not only violate the terms and conditions of the AdSense program but also often harm the efficacy of the ads, Google posted on their Blog (Clarifying our ad implementation policies).

Placing AdSense code within an iframe is a common tampering practice, so that it can be displayed on another page, Google forbids this strictly in their terms.

“Improperly iframed ads are a disservice to our advertisers since the ad itself can be obscured. Not only are they not viewable, these implementations can lead to accidental clicks if these hidden ads are placed in a location that users frequently click,” wrote Cecelia Choi from the AdSense Policy team.

A related improper use of AdSense ads is what Google calls “cross-domain iframing abuse,” which allows sites to frame ads belonging to another site without the publisher’s knowledge.

To make its policy clear in this respect, Google has modified the language in its AdSense policy related to this issue to read:

“AdSense code may not be altered, nor may the standard behavior, targeting or delivery of ads be manipulated in any way that is not explicitly permitted by Google. This includes but is not limited to the following: clicking Google ads may not result in a new browser window being launched, nor may Google ads be placed in an iframe.”

If a site requires the use of iframes for valid technical reasons, the publisher can request an authorized exception from Google. Otherwise, Google may cut off its ad serving connection to sites it finds misuing iframes with its ads.