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Originally Posted by Matthijs
What PDF writing lib could be used in the device? Is there an Open Source one available written in C(++)? The PHP option is of course not feasible on the device itself.
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The only one I know that is not in Java is pdfedit, and is not a lib+program_for_ui, just a program.
http://pdfedit.petricek.net/
http://pdfedit.petricek.net/index.php?page=index_e
It's a GPL'd C++ application written using the Qt3 libraries and boost. Their authors describes it as a program using "C++, XPDF, QT3 and QSA". Depends heavily on scripting (QSA).
Transforming it to a library could be tough, but it's a start.
It may be worthy investigating it, as it enables exactly what users are requesting (adding/editing text comments, adding objects, etc), and can be compiled and put on the iliad (it has a command-line version; the easiest path would be to modify it to do whatever is needed).