that does indeed seem like the broadest CYA clause their lawyers could come up with, but perhaps it's not broad enough, because consider how the The Intercept was able to determine which of the calls were between prisoner and attorney: The Intercept just checked (for a sample of the 77 MM records) for membership of the phone number called, in a directory of lawyers and law firms (obviously under-inclusive because this directory usually lists office lines not individual lawyer's cell phones, as the article states). In other words, those phone numbers were indeed "known" to belong to attorneys--in fact, publicly known.