Payments made by one party, (the licensee) to another, (the licensor) for the use of assets owned by the licensor. In most cases royalties are periodic payments made for the continual use of assets. The amount of a royalties payment depends on how the two parties have agreed to calculate the royalties owed.
In the oil and gas industry, companies pay landowners a royalty rate for the right to extract natural resources, such as petroleum and natural gas, from the landowner's property. Similar agreements exist in the mining industry for minerals such as copper and silver. 
An override is a percentage payout to a person of a mineral interest or mineral lease, that is paid after drilling and production costs are taken out, before paying royalties, or that is paid by an agent or publisher or user to the creator of a work.