Freezable.IsFrozen and DependencyObject.IsSealed

What is the difference betwe开发者_Go百科en those two? Aren't they semantically equivalent?

No. Freezable.IsFrozen can be toggled (one time) from outside the class by calling the Freeze() method, DependencyObject.IsSealed is read-only and its value can only be set internally by the class itself.