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A federal judge has ruled that Google illegally used its online marketing technology to boost profits, marking the second time in less than a year Google has been deemed an abusive monopolist. The ruling follows an August decision concerning Google's search engine. The Justice Department's case focused on Google's dominance in ad technology, alleging anti-competitive practices harming publishers. While the judge found Google's acquisitions of DoubleClick and Admeld weren't anti-competitive, the core practice of tying its ad server and exchange together was deemed illegal. Google plans to appeal, and penalty hearings are expected to begin soon. This latest decision adds to Google's ongoing antitrust battles.

Prepared by Christopher Adams and reviewed by editorial team.