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type SignatureInformation = object;
Information about signature used in document.
signatureFields: SignatureAnnotation[];
An array with all available signature fields in the document. The signatureFields represents all signature fields in a file, whether it is signed or not.
signed: boolean;
The flag indicates whether the document is signed. Note, a document is considered signed if it contains at least one signature field with the signatureValue property filled in.
signedByFields: SignatureAnnotation[];
An array with signature field(s) which was used to sign the document. The signedByFields only represents signed signature fields.