In the spirit of “any suggestions and/or modifications will be very much appreciated”, I have inserted comments below.

yes to your clarification, Matija -- I was talking about my/our own works. However ... What about cases that have been adjudged by the court as uncopyrightable or public domain contrary to a claim wit

I worry that I did not describe my use-case well. Let me try again. Rule: in my organization, all our OSS must have have explicit clearance based on SPDX-License-Identifier and SPDX-FileCopyrightText

How should I correctly tag uncopyrightable material? The U.S. Copyright Office states in https://www.copyright.gov/circs/circ33.pdf that some materials are "uncopyrightable because they contain an ins