Lock digital signature after an Infopath form has been signed

Question

I created a form with multiple sections and signatures. I selected the When signed, make controls read-only. However, when the form is opened after the submission the remove option is still available. I want to lock down signature after it is submitted.
If updates are made to the form then it opens a new version of the from  if approval required.

Answer 1

Hi Christic3,
This is a bit geeky, but here goes. Think of the PDF file in two layers (there are really more, but we'll keep it at two for simplicity). The bottom layer is the PDF content such as fonts, structure tags, and pages. The top layer is form data and comments (aka annotations). When you sign the PDF you sign everything (both layers), but the only allowable changes to the file are additions to the top layer. You can add form data and comments, but you cannot modify anything in the bottom layer without breaking existing signatures. In fact, you can't change (by change I mean modify or delete) anything on the top layer either, but you can add new (unsigned) items.
Bookmarks are part of the underlying PDF structure. Because they are as integral to the underlying structure as anything else, the ability to modify the bookmarks is locked after signing, otherwise it would be too easy to break the signature.
Steve