Martin Leboeuf wrote:
> Then, using Acrobat, I open the file and "enable usage rights",
> so that end users can save filled versions of the pdf form.
 > Finally, I modify the file using the code above.

After that, you CAN'T change objects in the document without breaking 
Reader Enabling, unless you:
(1) either use Adobe software,
(2) or work in append mode.

I think you should consider option (1).
You won't find non-Adobe software that is capable of (2);
even when using iText, you'll have to do plenty of specialist
programming: adding a new catalog dictionary, have the XFA
entry pointing to a new XFA stream. It's not something you
can do without understanding the internals of PDF and XFA.

br,
Bruno

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