(By Nancy A. Youssef, McClatchy Newspapers) WikiLeaks' release of tens of thousands of classified government documents on three separate occasions this year has prompted U.S. officials to add layers of new safeguards, but that very impulse has sparked a debate among experts about whether those new protections might make national security secrets more vulnerable, not less.Of particular concern is that officials will be tempted to keep documents under wraps by giving them higher classifications so that fewer people have access to them.