License4J is a total solution for software product licensing. It provides Java libraries and GUI tools for generating and validating license keys, license text, and floating license files. It is designed to be easy to use and integrate in your application. A License Manager GUI is provided for generating and storing licenses, and a Floating License Server can host and serve created floating licenses. An Online.License4J System allows single or multiple license activations to be defined. It also supports license generation through HTTP post either from a payment processor or a custom script.
The ABOUT tool and ABOUT files provide a simple way to document the provenance (origin and license) and other important or interesting information about third-party software components that you use in your project. The tool is a command line based utility. The ABOUT tool helps automate OSS compliance that is needed throughout the software lifecycle.