I have created a simple toolbar that deals with some sesitive data for the user. I know a dll can be signed so that someone else can't go in and simply replace my dll with one they have modified. Does IE have any functionality to check the validity of a dll which it loads as a toolbar? If not any ideas as to how i could do this? I thought about creating a service that woud constantly check the signature of my dll, but that seems a bit over kill. Any leads would be great.. Thanks!