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"An NSL is a demand letter issued to a particular entity or organization to turn over various record and data pertaining to individuals. NSL's can only request non-content information, such as transactional records, phone numbers dialed or email addresses mailed to and from. They also contain a gag order, preventing the recipient of the letter from disclosing that the letter was ever issued."

Gag orders that prevent people from disclosing orders they have received (and the existence of the gag order itself) are scary, scary stuff. Thank goodness for Nicholas Merrill and the ACLU, who filed http://en.wikipedia.org/wiki/Doe_v._Ashcroft to overturn the gag order provisions relating to NSLs.
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