Google’s master plan was to create the world’s largest digital library, but a federal judge in New York has rejected a $125 million legal settlement that would have allowed the internet company to sidestep copyright issues.

The decision throws into legal limbo one of the most ambitious undertakings in Google’s history, and it brings into sharp focus concerns about the company’s growing power over information. While the profit potential of the book project is not clear, the effort is one of the pet projects of Larry Page, the Google co-founder who is set to become its chief executive next month. And the project has wide support inside the company, whose corporate mission is to organize all of the world’s information.

“It was very much consistent with Larry’s idealism that all of the world’s information should be made available freely,” said Ken Auletta, the author of “Googled: The End of the World as We Know It.”

But citing copyright, antitrust and other concerns, Judge Denny Chin said that the settlement went too far. He said it would have granted Google a “de facto monopoly” and the right to profit from books without the permission of copyright owners.