From page 170 of Samuel Clark's State and Status: The Rise of the State and Aristocratic Power in Western Europe:
In the Spanish/Austrian Low Countries a change in the ancient coat of arms of a seigneurie could not be made except by authorization of sovereign. The coat of arms of a noble family could be appropriated by the purchaser of its seigneurie if he or she obtained letters patent from the sovereign. Clark, Samuel., State and Status: The Rise of the State and Aristocratic Power in Western Europe, p170
What difference is there between "seigneurie" and "manor" in a feudal system?