slm4j (Starschema License Manager for Java) is a simple and easy-to-use license file generator and validator package for Java programs. It includes a command line tool for generating private and public keys for cryptographic signing, and a runtime class (or jar module) to validate the generated keys. The signed data is an ASCII armored file, which could store date or time limitations, functionality restrictions, or any user specified strings. The embedded license file validation ensures that file is not modified by using the DSA algorithm.
EasyLicenser is a simple, low-cost, and powerful software license manager focused on ease of use for both the software vendor and the end-user. EasyLicenser includes e-commerce and customer relationship management functionality, as well as floating license key management for use with the companion product, Orion network license server.
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.