This article is missing information about details of what Udal law is and how it differs from other systems of law. Please expand the article to include this information. Further details may exist on the talk page.(August 2008)
The udal tenant holds without charter by uninterrupted possession on payment to the Crown, the kirk, or a grantee from the Crown of a tribute called scat (Danish: skat, now meaning "tax"), or without such payment, the latter right being more strictly the udal right. They are convertible into feus at the option of the udallers.