Keep a pdf form editable after filling it with pdftk

Question

I'm using pdftk to fill a form but the output form isn't editable, when I open it on acrobat reader I'm getting an error message: "This document enabled extended features in Adobe Reader, The document has been changes since it was created and use of extended features is no longer available."

is it possible to keep the document editable?

Answer 1

To get rid of the Adobe digital signuture, just "cat" the signature out of the PDF.

pdftk signed.pdf cat output notsigned.pdf

Answer 2

No. AFAIK for a PDF to be editable in Adobe Reader it has to be digitally signed by Adobe Acrobat. Obviously manipulating a PDF with pdftk changes the PDF so the signature is no longer valid.