Editing Documents
Changing a document you already have: combining files, stamping pages, adding annotations, filling and flattening forms, editing text, and rewriting the metadata.
Whichever change you make, there are two ways it reaches disk. A PdfWriter
rebuilds the whole file, which is what pdfReader.ToWriter gives you and what
most of these answers use. A PdfAppender copies the original bytes and writes
an incremental update after them, so earlier revisions stay intact and any
signature already on the document remains valid. Rebuild a file that has been
signed and you invalidate the signature.
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