Analysts at the National Security Agency can now secretly access real-time user data provided by as many as 50 American companies, ranging from credit rating agencies to internet service providers, two government officials familiar with the arrangements said. Several of the companies have provided records continuously since 2006, while others have given the agency sporadic access, these officials said. These officials disclosed the number of participating companies in order to provide context for a series of disclosures about the NSA's domestic collection policies. The officials, contacted independently, repeatedly said that "domestic collection" does not mean that the target is based...