https://www.eclipse.org/legal/epl-2.0/
· The Keyple Plugin SE Communication Library is an add-on to allow an application using Keyple to interact with Famoco terminals.
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 keyple-plugin-se-communication-lib-2.1.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.