What was the concern expressed by a publisher trade group?

Google Inc. said Friday that it had suspended its high-profile effort to scan copyrighted books from libraries into its searchable index. The Internet giant--which sees the program as part of its grand mission to organize the world’s information--said it would wait until November before resuming the work to give publishers time to say which titles they don’t want copied. In the meantime, Google plans to keep adding books that aren’t copyrighted and those that are submitted by publishers for inclusion. But a publisher trade group said Google’s move failed to answer its concern that the company was violating copyrights by scanning books without permission.