Luxembourg's data protection authority is investigating Microsoft-owned Skype for its alleged cooperation with the U.S. National Security Agency's Prism spying program, the agency said Friday. Luxembourg's data protection authority, CNPD, is investigating Skype's links to NSA spying programs after receiving several complaints, said Tom Kayser, a spokesman for the authority. "I can't really talk about the details of the investigation because it is still ongoing," he said.