SPDX is a compliance tool. It's designed to help people comply with their obligations. It doesn't cover every possible eventuality, and this situation falls outside the spec. IMHO. Having said that, o

This one is simple: BSD AND GPL-mumble for those files that contain both BSD and GPL code. Warner

You are right, this isn't the right place for this debate. I can't even parse what you are saying here. copyleft has no legal basis as a term, so I'm not at all sure what you are saying. You are also

Do you have one that does or that refutes the theory that the copyright holder granted you the ability to do certain things, but not to change the license? Without that, you are redistributing copyrig

What does that have to do with anything? This is marketing material, not a license nor a grant to "file off" the old license and add your own new one. You are only allowed to add your new one and the

Are you allowed to do that without it becoming an AND? You can't just change the terms w/o permission like that I'd imagine... And I'm not sure how it would generalize... Warner

What makes you think they don't apply? If you have to reproduce the notice, the terms apply. You can't just take code and change the license without the permission of the copyright holders/owners/etc.