1、JDEasyflow use bpmn-js(https://bpmn.io/) component to render bpmn diagram. You should obey 
their license rule(https://bpmn.io/license/) when using related function. Especially, you
should notice and obey the bellow rule in their license:
"The source code responsible for displaying the bpmn.io project watermark that
links back to https://bpmn.io as part of rendered diagrams MUST NOT be
removed or changed. When this software is being used in a website or application,
the watermark must stay fully visible and not visually overlapped by other elements."

2、JDEasyFlow license can be seen in LICENSE.txt. In addition, JDEasyFlow depends on a number of 
components with separate copyright notices and license terms. Your use of 
these components is subject to the terms and conditions of the licenses of the 
following links:

>>> Apache maven:
https://github.com/apache/maven/blob/master/LICENSE

>>> Spring framework:
https://github.com/spring-projects/spring-framework/blob/main/src/docs/dist/license.txt

>>> Commons-logging:
https://github.com/apache/commons-logging/blob/master/LICENSE.txt

>>> Logback:
https://logback.qos.ch/license.html 

>>> Slf4j:
https://www.slf4j.org/license.html

>>> Commons-lang3:
https://github.com/apache/commons-lang/blob/master/LICENSE.txt 

>>> Commons-io:
https://github.com/apache/commons-io/blob/master/LICENSE.txt 

>>> Commons-collections:
https://github.com/apache/commons-collections/blob/master/LICENSE.txt

>>> Jackson:
https://github.com/FasterXML/jackson-databind/blob/2.11.4/LICENSE
https://github.com/FasterXML/jackson-annotations/blob/2.11.4/LICENSE
https://github.com/FasterXML/jackson-core/blob/2.11.4/LICENSE

>>> Junit:
https://junit.org/junit4/license.html

>>> Hamcrest-core:
http://hamcrest.org/JavaHamcrest/

>>> Lombok:
https://github.com/projectlombok/lombok/blob/master/LICENSE

>>> Activiti:
https://github.com/Activiti/Activiti/blob/develop/LICENSE.txt

>>> Joda:
https://www.joda.org/joda-time/licenses.html