NEW YORK (AP) — The Authors Guild says Google Inc. should pay $750 per copyrighted book in its digital library.

The group is making the demand in New York federal court.

It says Google should fork over that amount for books it has reproduced, distributed or displayed for the world's largest digital library. That would not apply to books in the public domain.

Google already has scanned more than 20 million books.

The Mountain View, Calif.-based company said through a spokesperson that it believes it is copying books legally. It also says in court papers that copyright law permits it to create the equivalent of a library card catalogue for books.

Earlier this year, Judge Denny Chin granted class certification to authors in the 7-year-old court case.

The latest court papers were unsealed Friday.