Google has made eBooks accessible from desktop and mobile browsers and through applications, as well as compatible with a variety of e-book reader devices.

The eBooks service and store can be accessed from applications for the Chrome browser and for Apple iOS and Android devices. About 2.5 million eBooks applications have been installed so far.

With the launch of the affiliates program, Google continues its push into the digital books market, despite a major legal setback that has kept millions of books out its online store.

In March, Judge Denny Chin from the U.S. District Court for the Southern District of New York copyright infringement lawsuits from authors and publishers.

The settlement proposal drafted by Google and the plaintiffs -- the Authors Guild and the Association of American Publishers -- would have given Google broad access to sell millions of books it has digitized from university collections but without permission from copyright owners.