A more thorough explanation:

Definition: De me (dee mee) is a Latin phrase that means "of me." It was commonly used in feudal grants to indicate that the permission of a superior lord was not needed for the conveyance.

For example, if a lord wanted to grant land to a vassal, they would use the phrase "de me" to indicate that they were granting the land directly to the vassal, without the need for approval from a higher authority.

This phrase is different from "a me de superiore meo," which means "from me of my superior." In this case, the estate was to be held of the superior and required confirmation from them to be valid.

Overall, "de me" was a way to establish direct ownership and avoid the need for approval from a higher authority.