A more thorough explanation:

EXTRA CURTEM DOMINI

Extra curtem domini is a Latin term used in law. It means "beyond the domain of the superior." In feudal times, a vassal was not usually required to perform a service beyond the jurisdiction of their superior.

For example, if a vassal was required to transport grain from one place to another, they would only be obligated to do so within the jurisdiction of their superior. If the transportation of grain was required beyond the superior's jurisdiction, the vassal would not be obligated to perform the service.

Another example could be a vassal who was required to provide military service to their superior. If the superior's territory was attacked by an enemy beyond their jurisdiction, the vassal would not be required to provide military service in that situation.

These examples illustrate how the term extra curtem domini was used to define the limits of a vassal's obligations to their superior.