I designed a PDF form in Acrobat XI that keeps track of my professional development over a 5 year period. Each year my supervisor signs it with a digital signature. After he signed it the first time I noticed I was a lot of features were grayed out such as delete page, extract page, insert page and rotate page. I need to add pages to this document so I can attach evidence of my professional development each year. So when I complete a course or workshop I insert the certificate of completion at the end of the PDF. I also want to delete a few older pages. How can I regain these features but still work with signatures?
When a document is digitally signed, Acrobat no longer allows most types of modifications. Such modifications would invalidate the digital signature, making it meaningless. You can add signed PDFs to others as file attachments though.