Hmm, yes, sort of.
There is not very complicated tag support, and that is, is implemented in pdftex / luatex. Bookmarks and cross-references in a document are supported by tags. More complicated work was also done at TUG conferences, but at the moment all this is under development.
Context / luatex better supports Latex for this kind of thing: there is some support for interactive documents using context layers, where the contents of the layers change when buttons are clicked in the PDF. I think this should be done with tags.
I have never heard anything like embedded forms, digitally signing or embedding a Latex / Tex / Context source in a received PDF file, but in principle this is all possible.
Charles Stewart
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