sign pro PDF - Version 3
FAQs
Why can't I open my dynamic (XFA) PDF document with sign pro PDF?
Why can't I open my dynamic (XFA) PDF document with sign pro PDF?
Answer
This is because an XFA (dynamic) PDF is not a standard PDF Acroform.
Due to the manner in which Adobe locks XFA forms they cannot be displayed by most viewing applications, including sign pro.
The only viewers that we are aware of that can reliably display these forms are Adobe’s own products, although some Foxit PDF viewers appear to be XFA-enabled.
Please see this PDF FAQ