The master log is a log maintained aboard starships, which detail all design changes and operational changes made to the ship, and incorporates a vessel's shakedown log.

Due to the sensitive nature of the information stored within the log, the master log could only be accessed from main engineering and engineering and command terminals on a starship's main bridge. Access to the logs could only be approved by a command-level officer, or the ship's chief engineer. (TNG - Slings and Arrows eBook: A Sea of Troubles)

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