LICENSE.txt

While most DKPro-Keyphrases modules are available under the Apache Software License (ASL) version 2, there are a few modules that depend on external libraries and are thus licensed under the GPL. The license of each individual module is specified in its LICENSE file.
It must be pointed out that while the component's source code itself is licensed under the ASL or GPL, individual components might make use of third-party libraries or products that are not licensed under the ASL or GPL. Please make sure that you are aware of the third party licenses and respect them.