SAN FRANCISCO  Aiming to outdo Amazon.com and recapture the crown for the most digital titles in an e-book library, Sony is announcing Thursday a deal with Google to make a half million copyright-free books available for its Reader device, a rival to the Amazon Kindle.

Since 2004, Google has scanned about seven million books from major university and research library collections. For now, however, Google can make full digital copies available only of books whose copyrights have expired.

The books available to Reader owners were written before 1923 and include classics like “A Connecticut Yankee in King Arthur’s Court,” by Mark Twain, and “The Awakening,” by Kate Chopin, as well as harder-to-find titles like “The Letters of Jane Austen.”

Image The Sony Reader device is a rival to Amazon.coms Kindle. Credit... Daniel Acker/Bloomberg News

“We have focused our efforts on offering an open platform and making it easy to find as much content as possible, and our partnership with Google is another step in that direction,” said Steve Haber, president of the digital reading business division of Sony Electronics. “We would love to continue working with Google to see how we can get more content for Reader owners.”