Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/335#issuecomment-72366621
This is not about the license of the software / code itself. The [ASF
homepage](http://www.apache.org/licenses/#clas) says
> The ASF desires that all contributors of ideas, code, or documentation to
the Apache projects complete, sign, and submit (via postal mail, fax or email)
an Individual Contributor License Agreement (1) (CLA) [ PDF form ]. The purpose
of this agreement is to clearly define the terms under which intellectual
property has been contributed to the ASF and thereby allow us to defend the
project should there be a legal dispute regarding the software at some future
time. A signed CLA is required to be on file before an individual is given
commit rights to an ASF project.
An ICLA also prevents that major parts of the code base need to be removed
/ rewritten, if a contributor decides to change the license in the future.
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