Seigniorage

Part of speech: noun (n.)

1. Something claimed or taken by virtue of sovereign prerogative; specifically, a charge or toll deducted from bullion brought to a mint to be coined; the difference between the cost of a mass of bullion and the value as money of the pieces coined from it. If government, however, throws the expense of coinage, as is reasonable, upon the holders, by making a charge to cover the expense (which is done by giving back rather less in coin than has been received in bullion, and is called "levying a seigniorage"), the coin will rise to the extent of the seigniorage above the value of the bullion. J. S. Mill.

2. A share of the receipts of a business taken in payment for the use of a right, as a copyright or a patent.