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

Hi Lars,

On 19/06/2019 09:20, Lars Kurth wrote:

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%3Ba=blob%3Bf=CONTRIBUTING

Thank you for the input! I will add a word in the commit message:

"Note the imported header is licensed BSD-2-clause. This is fine as it is compatible with GPLv2-only".

Cheers,