And in this FAQ entry: http://1t3xt.be/?X000403

I read the FAQ and tried the second suggestion (used the append flag). It
works! I edited the acroform in a rights enabled pdf file using iText and
then I was able to edit the acroform again using Acrobat Reader and save the
file. I also noticed that if I tried to add a new page to the pdf then I got
the same message stating the document has been changed (but that's ok with
us). 
As we are concerned with being compliant with the Adobe License, we would
like to have a better understanding of why editing the acroform multiple
times is possible. Why is appending "the document changes as a new revision"
(
http://www.1t3xt.info/api/com/lowagie/text/pdf/PdfStamper.html#PdfStamper(com.lowagie.text.pdf.PdfReader,%20java.io.OutputStream,%20char,%20boolean)
javadocs ) any different than simply editing a pdf file via a stamper?
My assumption is that Adobe allows the developer/user to edit the Acrofield
values as many times as they wish, by appending the changes. Changing the
pdf structure will remove user rights regardless of the appending flag.
Finally saving Acrofield values without setting the append flag to true is
treated as changing the structure. Is this correct?




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