The Imperiatrix Imprimatur was a biodata imprint of the first Imperiatrix Pandora.

Romana was infected with the Imprimatur in her first incarnation, but shortly afterwards her tutor Irving Braxiatel found her and suppressed it in her mind via hypnosis. When this memory block was threatened (AUDIO: Lies) by torture from the Shadow, (TV: The Armageddon Factor) Romana regenerated into her second incarnation. (TV: Destiny of the Daleks) Pandora later claimed to Romana II that she contained the Imprimatur and that it guided her actions toward the same path as the first Imperiatrix. (AUDIO: Lies)

After escaping the Matrix, Pandora used the Imprimatur to extract biodata and form a body for herself based on Romana's first incarnation. (AUDIO: Imperiatrix)

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