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Because open source code is freely distributable, anyone can take that code and create their own unique mutant mashup version of it any time they feel like it. Whether anyone else in the world will care about their crazy new version of the code is not at all clear, but that's not the point. If someone wants it bad enough, they can create it -- or pay someone else to create it for them. This is known as "forking". It's the very embodiment of freedom zero, and it's an essential part of every open source license.