If someone gets hacked, and no one leaks the content, were they ever really hacked? Well, yes—just ask NATO. Hackers from the group Anonymous, which is loosely allied with WikiLeaks, say they’ve breached security at the defense alliance and accessed restricted material. To prove they’d done so, they posted a PDF on Twitter with a “NATO Restricted” heading but said it would be “irresponsible” to publish most of what they acquired. Nonetheless, they said they would release some parts of the approximately one gigabyte of data in coming days. NATO has not commented. Anonymous targeted those who moved to cut off WikiLeaks’ funding in late 2010, and U.S. officials arrested 14 on suspicion of working with the group on Tuesday.