This is not meant to be legal advice.
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The revisions were prompted by technological changes relating to the Internet and software industries, particularly use of software patents, internationalizing the GPL, the development of digital rights management (DRM) tools. With respect to DRM, section 3 of the GPL version 3 requires waiver of certain rights that forbid circumvention of technological measures. With respect to patents, the preamble and section 7 of the GPL version 3 has the view that patents should not restrict development and use of software, and thus, cannot be used to render a free program non-free.
The GPL version 3 has the basic copyleft concepts, meaning the rights to copy, modify, and redistribute a GPL licensed program, imposes the obligation to license to others the source code. Many developers are aware of this concept even more so than some attorneys who do not deal much with open source.
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