NEW YORK - Cell phone owners will be allowed to break software locks on their handsets in order to use them with competing carriers under new copyright rules announced Wednesday.

Other copyright exemptions approved by the Library of Congress will let film professors copy snippets from DVDs for educational compilations and let blind people use special software to read copy-protected electronic books.

All told, Librarian of Congress James H. Billington approved six exemptions, the most his Copyright Office has ever granted. For the first time, the office exempted groups of users. Previously, Billington took an all-or-nothing approach, making exemptions difficult to justify.

"I am very encouraged by the fact that the Copyright Office is willing to recognize exemptions for archivists, cell phone recyclers and computer security experts," said Fred von Lohmann, an attorney with the civil-liberties group Electronic Frontier Foundation. "Frankly I'm surprised and pleased they were granted."

But von Lohmann said he was disappointed the Copyright Office rejected a number of exemptions that could have benefited consumers, including one that would have let owners of DVDs legally copy movies for use on Apple Computer Inc.'s iPod and other portable players.

The new rules will take effect Monday and expire in three years.

In granting the exemption for cell phone users, the Copyright Office determined that consumers aren't able to enjoy full legal use of their handsets because of software locks that wireless providers have been placing to control access to phones' underlying programs.

Providers of prepaid phone services, in particular, have been trying to stop entrepreneurs from buying subsidized handsets to resell at a profit. But even customers of regular plans generally can't bring their phones to another carrier, even after their contracts run out.

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