At Cheney's initiative, the United States stripped terror suspects of long-established rights under domestic and international law, building a new legal edifice under exclusive White House ownership.
Experts said public companies worry about the loss of customer confidence and the legal liability to shareholders or security vendors when they report flaws.
The NSA has different reporting requirements for each branch of government and each of its legal authorities.
The National Security Agency has broken privacy rules or overstepped its legal authority thousands of times each year since Congress granted the agency broad new powers in 2008, according to an internal audit and other top-secret documents.