Perhaps you know this already, in which case please disregard my comments. In order for software to be called Open Source it needs to come with the source code for free. Anyone who is so inclined can modify the code and put their own name on the result and call it their own as long as the result is also open code. I do not believe that Calibre is open source since it does not come with the source code free, its what would be referred to as freeware, which does not come with the source code but the end result is free.
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