News embargo
In journalism and public relations, a news embargo or press embargo is a request or requirement by a source that the information or news provided by that source not be published until a certain date or certain conditions have been met. They are often used by businesses making a product announcement, by medical journals, and by government officials announcing policy initiatives; the media is given advance knowledge of details being held secret so that reports can be prepared to coincide with the announcement date and yet still meet press time.