Re: [Xen-users] Re: Xen and gnu gpl

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

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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