After modifying jbpm, what to do to be compliant with its license?

[steve.wang]

Hi:

Our product relies on jBPM 4.3 workflow library (jbpm.jar). After putting our product into product, some worflow issues have been found on the site. Our developers have downloaded its 4.3 source code from sourceforge.net and modified some classes (as listed below) to make it work in the problematic cases:

ActivityEnd.java 

ExecutionImpl.java 

ProcessInstanceEnd.java

TaskComplete.java

We decided to deploy this customized jbpm 4.3 jar file on our customer's site. So we would like to know what we need to do to make such modification compliant with jBPM 4.3's license?

Thanks a lot for your time in advance.

Steve Wang