U.S. officials offer few concessions on NSA spying to privacy board --- (Reuters) - The U.S. government is open to some changes to how it conducts its phone and Internet surveillance programs as long as they do not undermine the programs' effectiveness, U.S. officials told a privacy oversight board on Monday. -- How exactly the U.S. phone and online data-gathering programs could strike such a balance - helping thwart terrorist plots while also protecting Americans' privacy - is under review by the Privacy and Civil Liberties Oversight Board.