Billington noted that at least one company has filed lawsuits claiming that breaking the software locks violates copyright law, which makes it illegal for people to circumvent copy-protection technologies without an exemption from the Copyright Office. He said the locks appeared in place not to protect the developer of the cell phone software but for third-party interests.

Officials with the industry group CTIA-The Wireless Association did not return phone calls for comment Wednesday.

The exemption granted to film professors authorizes the breaking of the CSS copy-protection technology found in most DVDs. Programs to do so circulate widely on the Internet, though it has been illegal to use or distribute them.

The professors said they need the ability to create compilations of DVD snippets to teach their classes - for example, taking portions of old and new cartoons to study how animation has evolved. Such compilations are generally permitted under "fair use" provisions of copyright law, but breaking the locks to make the compilations has been illegal.

Hollywood studios have argued that educators could turn to videotapes and other versions without the copy protections, but the professors argued that DVDs are of higher quality and may preserve the original colors or dimensions that videotapes lack.

"The record did not reveal any alternative means to meet the pedagogical needs of the professors," Billington wrote.

Billington also authorized the breaking of locks on electronic books so that blind people can use them with read-aloud software and similar aides.

He granted two exemptions dealing with computer obsolescence. For computer software and video games that require machines no longer available, copy-protection controls may be circumvented for archival purposes. Locks on computer programs also may be broken if they require dongles - small computer attachments - that are damaged and can't be replaced.

The final exemption lets researchers test CD copy-protection technologies for security flaws or vulnerabilities. Researchers had cited Sony BMG Music Entertainment's use of copy-protection systems that installed themselves on personal computers to limit copying. In doing so, critics say, Sony BMG exposed the computers to hacking, and the company has acknowledged problems with one of the technologies used on some 5.7 million CDs.

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