🚀 go-pugleaf

I am designing an application which will create hundreds
of PDF pages every day. The original information comes
from a scanner and after the important fields are extracted
by OCR, the application's job is to create a page as identical
as possible to the original, with fillable fields.

The users fill out the forms and send them back to the sender.

Now, this is the interesting part: if a page belongs to a
new case, no big deal, a new PDF document is created. However,
the page may belong of a previously created document, which
may be being read/edited by the user at the time, my program
should append the incoming page at the end of the PDF document
and somehow ring a bell or something to notify the user that
the document being edited just became one page bigger.

The questions:

- Is there anyone out there working on this recreation of a
   paper form, filling and returning a copy which looks like
   the original? Any tips/pointers are appreciated.

- The above scenario seems almost like a mail-reading program.
   Are there any file locking protocols in PDF so a program
   (I use PDFlib)can edit a document that is being edited by a
   human being simultaneously?

TIA,

-Ramon F Herrera