jBPM is open source software, released under the Apache License 2.0.
Some other components we integrate with have their own license:
The new Eclipse BPMN2 plugin is Eclipse Public License (EPL) v1.0.
The web-based designer is based on Oryx/Wapama and is MIT License
The Drools project is Apache License v2.0.
This license is very liberal: it allows reuse for commercial purposes. Read the layman’s explanation for more information.