Addressing the Association of American Publishers at their annual conference, Tom Rubin, associate general counsel at Microsoft, accused Google of exploiting copyright and intellectual property through its search engine business.
Rubin accused Google of adopting a 'cavalier' approach to copyright over the search engine giant's use of books, films, music and TV programmes without permission, and criticised it for making millions of dollars from other people's intellectual property.
He said: "Companies that create no content of their own, and make money solely on the backs of other people's content, are raking in billions through advertising revenue and IPOs.
"Google takes the position that everything may be freely copied unless the copyright owner notifies Google and tells it to stop."
Rubin went on to defend Microsoft's business practices by highlighting its policy of seeking permission before using material created by a third party.
Google has come under fierce criticism in recent months from a host of media companies, including Viacom, which forced Google to remove over 100,000 of its video streams from YouTube.
Microsoft has sent letters to chief executives of large media companies recently, asking for support to stop internet piracy. The company now joins Walt Disney, News Corporation, Viacom and Time Warner in attacking Google's use of third party content.
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