The API is often the most creative part of software, because it can be the most difficult to get right. The API is the most publically visible part of your code, and once it is released into the wild it can be very difficult to fix it later or make substantial changes, without breaking a whole heap of dependencies. So you better make damn sure you put a lot of your creativity into the API to start with, and try and get it right first time. Thus I think we should be able to copyright APIs. But I am glad Google won this latest battle.
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