What is the SPDX License identifier for this repo?

[txtsd]

The SPDX License list can be found here:
https://spdx.org/licenses/

[Ken Goldman]

I believe that this is BSD-3-Clause. If you agree, is there a file or other place that I should add it?

[txtsd]

Yes, just create a LICENSE in the root dir with the contents/text of the BSD-3-Clause:
https://spdx.org/licenses/BSD-3-Clause.html

[Ken Goldman]

Isn't that already there? There is a LICENSE file. Do I need something additional, like 'SPDX=something'?

[txtsd]

Nothing additional is needed, but the contents of the file have to make sense.
So the file that exists has (c) Copyright IBM Corporation 2016. and All rights reserved. which are not BSD-3-Clause.
Do you know if they supersede (or how they supplement) the BSD license?
We could end up with an SPDX string like BSD-3-Clause OR LicenseRef-IBMfoobar

[Ken Goldman]

Is the issue the phrase "All Rights Reserved"? IANAL, but my understanding is that this is obsolete but OK. E.g., it's in the Linux kernel at LICENSES/preferred/BSD-3-Clause.

If this is a real issue blocking your use case, can you perhaps have your legal team contact me?