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xen-users
Re: [Xen-users] Re: Xen and gnu gpl
On Monday 09 March 2009 10:02:34 Christian Tramnitz wrote:
> Im not an lawyer either but I think this has nothing to do with "derived
> work" and/or kernel vs. userspace but rather with the second answer: the
> fact that Citrix owns Xen and releases it (kind of) using different
> licenses, for a more detailed explanation see:
> http://en.wikipedia.org/wiki/Dual-licensing
Well, I mentioned that possibility for completeness but the reason that I
think "derived works" vs "mere aggregation" is important is that Citrix
actually do not own the copyrights on all of Xen. Some of the code in the
hypervisor comes from Linux, for instance. Some of it comes from external
contributors.
They did actually rewrite much of the userspace tools (Xend, XenStored)
themselves for their closed-source product - therefore they hold all the
copyrights on those tools - but the hypervisor they use is still GPL and can't
easily / practically be closed off, even if they wanted to do that.
Cheers,
Mark
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