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"I am not a lawyer," as they always say, but this has been discussed many times and the answer seems to always come out as "absolutely not necessary", just inasmuch as a MS Word document doesn't get Word's license attached to it. Others are welcome to contribute more verbose assessments of this.

Personally, I think that any such interpretation (on the open-source or proprietary side) would be insane from a practical standpoint - does a Python script need to be GPLed? - but I'm sure there are many points of view.