Digital Signature Services
· DSS (Digital Signature Services) is an open-source software library for electronic signature creation
and validation in line with European legislation.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window sd-dss-5.12.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.