Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/996#issuecomment-129560955
Since Kafka is Apache, copying should be okay. It is good style, though, to
add to every copied file a note of origin.
And this is a temporary solution anyways, since we can get rid of most of
the copied files as soon as the new Kafka release is properly out.
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