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Rassilon Imprimatur was linked to (or a part of) the symbiotic nuclei which allowed a Time Lord access to time travel and in particular temporal vessels such as TARDISes.
TARDISes (or other time machines) had to be primed with a Rassilon Imprimatur to enabled them to travel safely in time. (DW: The Two Doctors)
The Imprimatur mapped Time Lords onto the time vortex as pure mathematics.
When a Gallifreyan was granted the rank of Junior Time Lord in the Time Lord Academy, they received their symbiotic nuclei. (EDA: Interference - Book One)
