The Yahoo Inc. breach of at least 500 million user accounts in a late 2014 cyberattack—the largest such breach on record—could trigger a number of legal and regulatory requirements from 47 different state breach notification laws in the United States, as well as inquiries from federal or international regulators.

“There are slight differences across the board, so someone in Yahoo’s law department is going to have a bad day trying to figure out how to notify all of these data breach victims,” said Larry Ponemon, chairman and founder of the Ponemon Institute, a privacy and data protection think tank.

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