Q:
How do I custom stamp PDF using pdftron?
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A:
In case you would like to add new content (stamps) to existing PDF
documents, please see http://www.pdftron.com/net/faq.html#how_watermark.
Essentially you would create new graphical elements using
'pdftron.PDF.ElementBuilder' class and write them to an existing page
using 'pdftron.PDF.ElementBuilder'. Exactly the same approach is used
to create new PDF pages from scratch, to add new content to existing
pages, or for page editing.