[REUSE] Custom exceptions

[Nico Rikken]

Hi Chris,

I'm not sure, but I assume REUSE doesn't support exceptions to keep the
code simple and also to align with SPDX principle where specifications
are done on the license level.

If you consider the SPDX license list https://spdx.org/licenses/ there
are already many variants listed for the Creative Commons licenses. As
I encountered a new one (CC-BY-2.5-AU), I just submitted a new license
to the SPDX registration: 
https://github.com/spdx/license-list-XML/issues/1171 and 
https://github.com/spdx/license-list-XML/pull/1274
I suggest you to do the same for a long-term fix that benefits others.
And for the short-term fix you can define a custom license.

Best,
Nico Rikken

On Mon, 2021-11-22 at 21:38 -0800, Chris Wilson wrote:
> I'm curious as to the reason why custom exceptions are not allowed
> (see https://reuse.software/faq/#custom-exception).
> 
> For example, I'd like to add a custom exception for 
> https://www.kicad.org/libraries/license/ which is an exception to the
> Creative Commons CC-BY-SA 4.0 License, but is not registered in 
> https://spdx.org/licenses/exceptions-index.html
> 
> For example, I'd like to be able to specify something like this:
> 
> SPDX-License-Identifier: CC-BY-SA-4.0 WITH LicenseRef-KiCad-
> Libraries-Exception
> 
> Thanks,
> Chris
> 
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