One things I would like to point out specifically for Stodder is the GPL is a copyright license. The GPL spells out what rights the author is granting to you for their licensed work under copyright law. While copyright is consistant across most of the work each county can have slight differences and their courts can interpret aspects of the GPL differently. Such as a German court could say the GPL is 100% invalid and un-enforceable (hasn't happended and there has been one German case which upheld the terms of the GPL), while a Canadian court could say the opposite.
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