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A search on ecosia.org got me discussions that tell me the message you see is about non-transferred rights (DMR), which is what you suspected.
The internet also told me that some CD players do not recognise WMA. (which I sorta knew)
(One forgets what the problem was after it was solved.)
I also know that for use in CD players a burned disc has to be finalised (which is NOT the default when you drag/copy to CDR) so the backups you made to CDR may not play in a Car CD-player because of that reason.
So, it could be that you have to finalise the CDRs in that XP machine.
Yet another thing, windows media player settings.
I prefer WMP over groove. (I also use VLC, but rarely for music, albeit that works too.)
In the settings I tend to set things to very private (almost no connection to internet allowed, no extra media info, thumbnails, album details, no automated search for media for library building, no automatic addition to libraries, and one can let it check or stop it from getting DMR....
The following could happen.
you do nothing, windows does its thing, WMP does its thing building libraries, and suddenly it has gotten the rights from the internet, et hopla, what did not play suddenly plays.
That too I have read yesterday, but I had encountered it myself too.
I wonder how you'll fix this.
You may have to rip those CD's all over again.
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