public NielsenNaesIiNw withCheckDigitString(String checkDigitString) {
        setCheckDigitString(checkDigitString);
        return this;
    }
Enter the check digit string for the watermark

@param checkDigitString
       Enter the check digit string for the watermark
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-medialive/src/main/java/com/amazonaws/services/medialive/model/NielsenNaesIiNw.java