The 2nd US Circuit Court of Appeals said it was too early for authors to be considered as a group in a lawsuit brought against the Mountain View, Calif-based company by the Authors Guild.
A three-judge panel of the Manhattan court said a judge presiding over the 8-year-old case must consider fair use issues before deciding whether to consider authors as a class.
The appeals court said Google's argument that the Authors Guild and other plaintiffs cannot fairly represent the interests of hundreds of thousands of authors because some of the authors will benefit from Google's digital library "may carry some force."
It also said a consideration first by a trial-level judge of Google's claims that it can fairly use snippets of longer works without violating copyrights "will necessarily inform and perhaps moot our analysis of many class certification issues."
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So far, Google has copied more than 20 million books. The appeals panel that heard arguments earlier this year seemed reluctant to get in the way of the plans. One judge said it would be a "huge advantage" for many authors while another said it would have "enormous societal benefit."
A lawyer for the Authors Guild told the judges earlier this year that there was only a "very remote" possibility that the lawsuit would derail Google's library. He said the aim of the lawsuit was to make sure authors are properly compensated.
Lawyers on both sides did not immediately respond to messages seeking comment.