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Rollback of U.S. spy powers would mark post-9/11 watershed
May 30 2015 1:29AM EST | Source: REUTERS TechnologyWASHINGTON (Reuters) - At 3:59 p.m. EDT on Sunday, the National Security Agency and telecommunications companies will begin mothballing a once-secret system that collected Americans' bulk telephone records, shutting down computers and sealing off warehouses of digital data.