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This is not true. Only the LGPL allows you to link to an open source library. That is why OpenJDK has a classpath exception (http://programmers.stackexchange.com/questions/119436/what-d...).

GPL requires you to release the source code to the customer of your software upon request. The person who buys the phone is the customer.

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Correct in some way. Given the source code, e.g. Drupal (GPL v2), if you develop a proprietary module that can be shipped independently but relies on the Drupal Core or other GPL module, you still not violate GPL. It doesn't matter you need to compile it or not, at the end, most scripting language is compiled to bytecode in some for of JIT.

I mentioned GPL in general, not dissecting to the various version, because the parent reply was about Google's fear of GPL (in general).

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