To comply with the Privacy Act, agencies must notify the public via a notice in the Federal Register whenever they create a system of records that contains personal information.
为了遵从秘密法案，在他们创造了包含个人信息的一系列记录的任何时候，机构必须以布告的形式通知公众。
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If there's too much doubt, the system might ask for another piece of information, such as a personal detail pulled from public-records databases, before letting the user finish logging in.