Quod sub certa forma concessum vel reservatum est
Quod sub certa forma concessum vel reservatum est, non trahitur advalorem vel compensationem. That which is granted or reserved under a certain form, is not to be drawn into a valuation. Bacon's Max. Reg. 4.
A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.