Cezar Butu of Romania, who pleaded guilty to taking part in hacking terminals at hundreds of U.S. Subway sandwich shops from 2009 to 2011, was sentenced this week to 21 months in prison.

Investigators eventually determined that thousands of payment cards and millions of dollars were stolen during the hacks, which Butu committed along with two other co-conspirators, according to the U.S. Department of Justice.

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