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Types of digital signatures in a PDF document

A PDF document allows multiple types of signatures, each serving a different purpose. The below table lists the different types of signatures supported in a PDF document.

Signature TypeSignatures allowed in a document (up to)Description
Certification signature1Certifies the document, similar to notarizing a paper document.
Usage rights signature1(Deprecated) Represents a 'Usage Rights' signature, which determines the types of modifications that are allowed to be performed on the document.
Approval signatureNo limitRepresents an approval of the document, when it is used as part of an approval workflow.

The PDFTron SDK provides the low-level API required for working with digital signatures, as laid out in the PDF specification. For the full detail of digital signatures in PDF, please refer to section 12.8 of the PDF standard ISO 32000-1, which describes the details of the support for digital signatures in a PDF document.

We support all three types of signatures in a PDF document.

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