SAN JOSE, Calif. — Google's ambitious plan to scan millions of old, out-of-print books, many of them forgotten in musty university libraries, has turned into one of the biggest controversies in the young company's history.

A broad array of opponents, ranging from Google competitors Microsoft and Amazon to libraries and copyright scholars, has joined forces to oppose Google's proposal to create a comprehensive online repository of the books and split the revenue from access to that catalog with authors and publishers.

Facing a Monday deadline to revamp the proposal, which Google struck with the book-publishing industry after a class-action lawsuit, the company with the unofficial motto "Don't Be Evil" is fighting the perception among some that the plan is an unseemly power play to seize the lucrative dominance of digital books.

Federal regulators, along with the U.S. Department of Justice, are asking a federal judge to reject the proposed class-action settlement with the publishers. Justice Department officials say Google's plans would potentially violate federal antitrust laws.

The issue has become more prominent because of Google's vast ambitions — its dominant search index, its march into maps, phones, video and other sectors of the Internet.

Google says negotiations are on track to have a revamped proposal ready before Monday's court deadline.

Google has insisted that its digital books plans, however they ultimately emerge from the ongoing talks, will leave room for compeitors.