How To articles about PDF signing

Main operations:

• Sign the PDF document
• Verify the X.509 certificate signatures
• Timestamp the X.509 certificate signature when signing the document
• Verify the timestamps of the signed document

Controlling the signature appearance:

• Display signature in PDF document
• Customize the text of the PDF signature widget
• Customize appearance and positioning of the signature widget
• Put unicode characters to the signature widget
• Customize signature widget's background