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Digital Signatures can be considered as the electronic equivalent of a physical signature with ink on paper. However an electronic signature also provides certain advantages over an ink-and-paper signature. It can secure and protect a digital document by creating a signing fingerprint uniquely identifying a sender. The recipient of the document and signature confidence of the sender's identity validates that the document has not been altered by anyone else since it was signed.
Some of these main advantages are:
A digital signature allows precise identification of who created/signed a document. It can be safely assumed that when a signature is valid, you know who signed it.
A digital signature allows users to easily validate whether the contents of a document were changed after it was signed.
A digital signature ensures that the signer cannot deny that they signed the document.
PDFTron SDK benefits include:
An e-signature is an annotation that appears in the document but has no additional identifiable information about the creator other than an author field which can be altered.
A digital signature on the other hand uses a cryptographic algorithm to uniquely identify the author and any alterations to the document including the annotations or e-signature would result in an invalid digital signature validation.
We provide a built-in PKCS#12 parser that enables signing using existing certificates with the '.pk12' or '.pfx' file extensions. Instead of using a private key file, a buffer containing certificate data can be passed. As a third option, you may write your own signature handler for signing in different signature formats and/or with different identity formats.
Sign a PDF Document
To digitally sign a PDF document
Certify a PDF Document
To certify a PDF document
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