Hackers who unlock Apple's iPhone from the AT&T network and share the method with 10 million of their closest Internet friends are inviting a lawsuit from the two companies, several intellectual property lawyers said Monday.

Apple and AT&T may have a legal case against unlockers under the U.S. Digital Millennium Copyright Act (DMCA), especially if they try to sell software code or devices that unlock the iPhone, the lawyers said. But the legal landscape gets a bit complicated -- there's a legal exception to the DMCA's anticircumvention provisions that allows individual mobile phone users to unlock their devices for use on other networks.

So figuring out how to unlock the iPhone yourself is not likely to be a DMCA violation, most of the IP lawyers said. But posting instructions or code online, even for free, may earn you a cease and desist letter from an unfriendly lawyer, and selling software or a device that unlocks the phone is inviting trouble, most of the lawyers said.

But there's plenty of disagreement among IP lawyers about the interpretation of the DMCA.

"It's an extremely grey [area], because I don't think the exemption was altogether clear," said Bart Showalter, an intellectual property lawyer in Dallas with the Baker Botts LLP law firm. "The idea of trying to use copyright to, in a sense, establish exclusivity in a service contract ... is going to be an interesting thing to watch."

John McLaughlin, founder of Uniquephones, based in Belfast, Northern Ireland, had planned to release software Saturday that would allow users to unlock their iPhone. But early Saturday morning, McLaughlin said he received a phone call from a man saying he was from a law firm representing AT&T. The caller said McLaughlin could be sued for copyright infringement.

Two other groups have claimed to have unlocked the iPhone.

Representatives of both AT&T and Apple declined to comment Monday on possible legal actions against unlockers.

Showalter suggested that unlocking the iPhone and posting code or instructions for free would likely fall under the exception to the DMCA's anticircumvention provisions, thus protecting the unlocker from legal action.wireless communication network," according to language from the U.S. registrar of copyrights. So if a hacker unlocks the iPhone, then posts the unlocking code for free, he's engaging in a legal activity and enabling others to engage in the same legal activity, said Michael Lewis, an IP lawyer with Fox Rothschild LLP.

The IDG News Service is a Network World affiliate.

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