We had discussed this before I think... These per-file copyright notices are not needed and inevitably just get out of date. For example, everyone forgets to update the year when they touch a file, and the notice should really say "Red Hat and contributors" in case we get a contribution from someone outside Red Hat. At which point the notice doesn't even tell you anything useful.

We already have detailed authorship info tracked in git anyway, which is the place you would need to look if you wanted to identify the provenance of any particular piece of code.

https://www.softwarefreedom.org/resources/2012/ManagingCopyrightInformation.html

If it is more about giving credit to individual contributors, then we could add something like an AUTHORS or CONTRIBUTORS file listing people's names... but again that is best just gleaned from the git history instead of being manually maintained.

It might be worth adding a brief note to the README pointing out that the code is licensed under GPLv2+ though. Right now we do have a COPYING file and SPDX-License-Identifier tags but nothing about it in README.

How about this: #49