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// For complete examples and data files, please go to https://github.com/groupdocs-signature/GroupDocs.Signature-for-Java
// setup Signature configuration
SignatureConfig signConfig = CommonUtilities.getConfiguration();
// instantiating the conversion handler
SignatureHandler<String> handler = new SignatureHandler<String>(signConfig);
// setup digital signature options
WordsSignDigitalOptions signOptions = new WordsSignDigitalOptions(CommonUtilities.getCertificatePath("acer.pfx"));
signOptions.getSignature().setComments("Test comment");
signOptions.getSignature().setSignTime(new Date(2017, 1, 25, 10, 41, 54));
//signOptions.setPassword("1234567890");
final SaveOptions saveOptions = new SaveOptions();
saveOptions.setOutputType(OutputType.String);
saveOptions.setOutputFileName("signed_output.docx");
// sign document
String signedPath = handler.<String>sign(CommonUtilities.getStoragePath(fileName), signOptions, saveOptions);
System.out.println("Signed file path is: " + signedPath);