@jon2020
Understand, first of all, I'm not an attorney and copyright law is often ridiculously stupid and complex. The legal rule of thumb, however, is that there are NO commercial recordings that are in the public domain, not even the old Edison cylinders which are still protected by sundry state laws. The only copyright-free recordings are the ones you make yourself of PD material.
But almost certainly, a situation such you describe would be so de minimus as to not merit concern. Problems start when one obtains a recording, rips it by whatever means, and then turns around and deliberately disposes of the original paid-for recording, one's license. Occasional, accidental loss of a CD, meh. Wholesale disposal of or especially deliberately reselling of ripped CDs, not so meh. And putting the ripped track up on the web to share, oh Lordy! Ask YouTube's legal dept. about the fun they've had!
Oh, and BTW, I'm of the school that believes that Redbook CDs can, at least in theory, perfectly reproduce a sound recording in the range of human hearing. The problems that occur are peripheral to the format itself, i. e. in the recording technique, ADC, mixing/mastering, DAC and playback equipment. For listening, higher sample rates and word lengths are generally silly and wasteful.
