Sign the document. This function stores changed properties in the document before signing. If the string parameter "OutputPath" is set, the document will be stored in a new file specified by that parameter. If string parameter "TemporaryDirectory" is set (and "OutputPath" is not set), the document will be stored in a new temporary file. Use getPathname() to obtain the pathname of that temporary file. In either case, the original file won't be modified (however, it will be deleted if it is a temporary file, ie, if "TemporaryDirectory" was used). If neither "OutputPath" nor "TemporaryDirectory" is set, the document will be written to the file from which it was loaded or to which it was most recently saved. Some document types may allow adding signatures only if all signatures of the documents are valid. For PDF documents, this function either signs or certifies the document, see integer parameter DocMDP. If you are using RFC 3161 timestamps and get error rc_unexpected_error with a message like "Contents overflow: xxx vs. yyy", try using a bigger value for integer parameter "TimeStampSize". This function performs a basic verification of the signature after signing a PDF document unless #DontVerifyAfterSigning is set. This ensures that the private key matches the certificate. If that verification fails, SignDocInvalidSignatureException will be thrown.

public void addSignature(
	SignDocSignatureParameters signatureParameters,
	SignDocVerificationParameters verificationParameters
)