Re: [Xen-devel] [PATCH v6 02/10] xen/arm: optee: add OP-TEE header files

[Lars Kurth <lars.kurth@citrix.com>]

On 17/06/2019, 18:28, "Stefano Stabellini" <sstabellini@kernel.org> wrote:

    On Mon, 17 Jun 2019, Julien Grall wrote:
    > On 17/06/2019 17:28, Stefano Stabellini wrote:
    > > Looking at https://www.gnu.org/licenses/license-list.en.html and also
    > > looking at the usage in the Linux kernel, I am pretty sure it is
    > > compatible. However, given that the Xen hypervisor as a whole is GPLv2,
    > > I think it would be more precise to say:
    > > 
    > > SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
    > 
    > Well, this is imported from OP-TEE. So I don't think we have the freedom to
    > change this copyright header here...
    
    Interesting point: I would have thought that given that this is a GPLv2
    project, if we went with SPDX, all files would need to have a
    GPL-2.0-only tag on them, plus, optionally, an OR XXX clause.
    
    Something for Lars to investigate.

That is not really how this works. The resulting Xen binary would be GPL 2.0, while individual parts of the source tree can be of different licenses.   
    
    > What I was asking is whether this is OK to import BSD-2-Clause code in Xen.
    > You seem to agree that it should be possible.
    
    Yep. The problematic BSD license is the BSD-4-Clause.
    
It is definitely OK: see http://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=CONTRIBUTING

Lars 

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