I've gotten tired of getting a document, printing it out, signing it, and scanning it back in. So, what I have done is scan in my signature. Then when I get a document, all I have to do is Add an Image to put my signature in the right place.

Now, here's the problem... If I send it on to someone, it looks like they can remove my signature (image). Even if I set the Properties to Locked, it looks like the next person can uncheck the Lock box and delete it.

Is there any way of making this permanent, so that no one (or at least no one but me) can remove or modify it?