A more thorough explanation:

Definition: Liberum tenementum is a legal term that refers to a plea of freehold. It is a defensive pleading used in common-law actions for trespass to lands. The defendant pleads either ownership of the land in question or authorization from the freehold owner.

Examples: If someone is accused of trespassing on someone else's land, they can use the plea of liberum tenementum to defend themselves. For example, if the defendant owns the land in question, they can use this plea to show that they have the right to be on the land. Alternatively, if the defendant has permission from the owner of the land, they can also use this plea to show that they are not trespassing.

Explanation: The examples illustrate how liberum tenementum can be used as a defense in cases of trespassing. If the defendant can prove that they have a legal right to be on the land, they cannot be accused of trespassing. This plea is used to show that the defendant either owns the land or has permission from the owner to be on the land.