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    SubjectRe: Dual-Licensing Linux Kernel with GPL V2 and GPL V3

    On Jun 10 2007 10:17, Simon Arlott wrote:
    >On 10/06/07 09:37, Tarkan Erimer wrote:
    >> BTW,I found a really interesting blog entry about which code in Linux
    >> Kernel is using which version of GPL :
    >>
    >> http://6thsenseless.blogspot.com/2007/02/how-much-linux-kernel-code-is-gpl-2.html
    >>
    >> You've got to take MODULE_LICENSE() into account. There is
    >>
    >> MODULE_LICENSE("GPL");
    >> MODULE_LICENSE("GPL v2");
    >> MODULE_LICENSE("GPL and additional rights");
    >> MODULE_LICENSE("Dual BSD/GPL");
    >> MODULE_LICENSE("Dual MIT/GPL");
    >> MODULE_LICENSE("Dual MPL/GPL");
    >
    >Surely that doesn't work since the entire Linux kernel is (and can only be)
    >released as GPLv2? Wouldn't anyone making changes to those files need to
    >obtain a copy under the other licence and explicitly release it under both
    >licenses in order to maintain that?

    http://www.eweek.com/article2/0,1759,1915720,00.asp
    has the answer. Quoting Linus:

    "If you want to license a program under any later version of the GPL, you have
    to state so explicitly. Linux never did."

    Hence, unless there's a "GPL 2 or later", all the "unspecified GPL" files
    are GPL2 only.


    Jan
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