pdf Integrated PDF signatures How integrated PDF signatures are "integrated"
Example
You want to add a signature to a PDF in a way that a standard conform PDF viewer (e.g. Adobe Reader) will recognize, display, and validate as an integrated PDF signature.
In that case you cannot simply externally create a signature covering the original PDF as is and expect to now have to merely somehow append that signature to the file. Instead you first have to build a new revision of the PDF document which includes a PDF AcroForm signature field whose value is a signature dictionary whose /Contents entry will eventually hold the signature of the whole new revision with the exception of the /Contents entry contents.
