Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/730#issuecomment-174940437
Hmm according to
http://www.apache.org/legal/resolved.html#can-works-placed-in-the-public-domain-be-included-in-apache-products,
it should be no problem to include work from the public domain in ASF
products. They only have to be attributed accordingly. What we then would have
to do is to simply exclude them from the checkstyle check.
Alternatively, we could also write/generate our own poems which we put
under the ASL.
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