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Sun released their "free java" source code under the GPLv2 to both win the free software crowd and capture peripheral innovation and bug fixing from the community. For the java standard edition (aka "the cat is out of the bag") there is an exception to the GPLv2 that makes it "reciprocal" only for the Java platform code itself but not for the user code running on it (or most people wouldn't even dare touching it with a pole). But such exception to the GPLv2 is not there for the mobile edition (aka "where the money is").