Digital signatures - chapter 2

These examples were written in the context of Chapter 2 - "PDF and digital signatures" of the Digital Signatures for PDF documents eBook.

c2_01_signhelloworld

A simple example of adding a visible signature to a document:

c2_02_signhelloworldwithtempfile

Signing a document using a temporary file to avoid OutOfMemoryExceptions with large PDFs:

c2_03_signemptyfield

Signing an empty text field with iText:

c2_04_createemptyfield

Creating an empty text field with iText:

c2_05_customappearance

Creating a custom appearance for the signature by adding a grey background:

c2_06_signatureappearance

Creating custom text, custom fonts and using right-to-left writing in a signature:

c2_07_signatureappearances

Adding a custom image:

c2_08_signaturemetadata

Adding metadata to the signature dictionary:

c2_09_signaturetypes

Ordinary (approval) and Certification (author) signatures:

c2_10_sequentialsignatures

Sequential signatures in PDFs:

c2_11_signatureworkflow

An example where multiple signatures are required:

c2_12_lockfields

Locking fields and documents after signing: