Add Digital Signature to PDF file

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When signing a PDF document using a signature, you basically confirm that its contents should remain “as is”. Consequently, any changes made afterwards invalidate the signature and thus, you know if the document has been altered. Certifying a document first, allows you to specify the changes that a user can make to the document without invalidating the certification.

In other words, the document would still be considered to retain its integrity and the recipient could still trust the document. For further details, please visit Certifying and signing a PDF.

To accomplish the above stated requirement, the following public API changes have been made.

  • isCertified(…) method is added to PdfFileSignature class.