Clinton last week handed over to the FBI her private server, which she used to send, receive and store emails during her four years as secretary of state. The bureau is holding the machine in protective custody after the intelligence community's inspector general raised concerns recently that classified information had traversed the system.
Clinton leads the race for Democratic presidential nomination by wide margin even though questions about her use of the server have since shadowed her campaign. Republicans have seized on the issue to raise questions about Clinton's trustworthiness.
But her emails show some messages she wrote were censored by the State Department for national security reasons before they were publicly released. The government blacked-out those messages under a provision of the Freedom of Information Act intended to protect material that had been deemed and properly classified for purposes of national defense or foreign policy.
What hasn't been released: data that could show how secure her system was, whether someone tried to break in, and who else had accounts on her system. A lawyer for Platte River Networks, a Colorado-based technology services company that began managing the Clinton server in 2013, said the server was provided to the FBI last week.
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A computer server isn't a marvel of modern technology. Just like a home desktop, the computer's data is stored on a hard drive. It's unclear whether the drive that Clinton used was thoroughly erased before the device was turned over to federal agents.
If it had been, it's also uncertain whether the FBI could recover the data. Clinton's lawyer has used a precise term, "wiped," to describe the deleted emails, but it was not immediately clear whether the server had been wiped. Such a process overwrites deleted content to make it harder or impossible to recover.