The feds might never let Apple in on the secret of the technique they used to unlock the San Bernardino shooter's iPhone 5c. According to Reuters, the hackers who discovered the flaw that led to the FBI's iPhone-cracking tool have the sole legal ownership of the method. Agents might not even know what the vulnerability is or how its resulting hardware works exactly. If you'll recall, a recent Washington Post report revealed that the feds got help from a group of hackers -- from outside the US, Reuters' sources said -- with a history of selling software vulnerabilities to the US government. They were paid a flat fee for the flaw they brought the FBI and the tool they developed.