Signer Class

Add a prepared signature

Adding a prepared signature is only required in very particular or specialized use cases. This method is the same as Sign(Document, SignatureConfiguration, Stream, OutputOptions), but without actually creating the cryptographic signature. The cryptographic signature can be inserted later using SignPreparedSignature(Document, SignatureConfiguration, Stream).

While the configuration can be created by any Provider, it is typically created by CreatePreparedSignature(Int32, String, String).

Add an unsigned signature field

Add an unsigned signature field that can later be signed (see UnsignedSignatureField).

Non-critical processing errors raise a Warning. It is recommended to review the WarningCategory and handle them if necessary for the application.

Add a document time-stamp

This type of signature provides evidence that the document existed at a specific time and protects the document’s integrity.

The features and format of the signature are defined by the Provider and the configuration.

Non-critical processing errors raise a Warning. It is recommended to review the WarningCategory and handle them if necessary for the application.

Add a document certification signature

This type of signature lets you detect rejected changes specified by the author. These signatures are also called Modification Detection and Prevention (MDP) signatures. The allowed permissions are defined by permissions.

The features and format of the signature are defined by the Provider and the configuration.

Non-critical processing errors raise a Warning. It is recommended to review the WarningCategory and handle them if necessary for the application.

Process a document

Apply document-level processing options without any signature operation. For example:

• To encrypt or decrypt PDF documents that may be signed (see the samples "Encrypt" and "Decrypt").
• To remove signatures and unsigned signature fields (see RemoveSignatures).
• To add validation information to existing signatures (see AddValidationInformation).

Non-critical processing errors raise a Warning. It is recommended to review the WarningCategory and handle them if necessary for the application.

Add a document signature

Document signatures are sometimes also called approval signatures. This type of signature lets you verify the integrity of the signed part of the document and authenticate the signer’s identity.

The features and format of the signature are defined by the Provider and the configuration.

Non-critical processing errors raise a Warning. It is recommended to review the WarningCategory and handle them if necessary for the application.

Sign a prepared signature

Event for non-critical errors occurring during signature processing