As a side note, the requirements in open-source licenses (such as redistributing source yourself, giving attribution, etc.) are only enforceable because of inte

As a side note, the requirements in open-source licenses (such as redistributing source yourself, giving attribution, etc.) are only enforceable because of intellectual property. Someone owns the copyright, and often has contributors assign the copyright to them, and they then own the IP. The license grants you conditional authorization to distribute the software, provided you comply with certain requirements. If you fail to do that, it's the copyright holder that can really sue.