CocoaPods/Specs — comment on commit f6506dc5b5f93cca2f82ff7172af9c522792ef9f
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By alloy:

Ah English-English or US-English… In general I personally tend to favor the original (you know, from England) over the US version, but I think that in this context most people will call it by its US name ‘license’.

http://en.wikipedia.org/wiki/License