Two licence types are available. You can purchase the whole MRules library or only the data acces and conversions frameworks.
The complete MRules licence is available for 699 € ($800) excl. taxes.
The data acces and conversions frameworks licence is available for 199 € ($230) excl. taxes.
The licence gives right for unlimited usage within a single company. It also provides free access to updates, limited to the same major version (for example : a licence for version 1.0.0 will allow product usage in all 1.x versions, but will no longer be valid for 2.x). It comes in the form of a JAR file to integrate the application CLASS_PATH.
To test the suitability of MRules for your needs, you can get a free trial license, with access to all features. The defaut trial period is one month, but it can be extended by a simple mail request.
For more informations, please read the entire End User License Agreement (EULA).