SRS, if that question was for me, I'm sorry to say I am not an expert. File formats that are sufficiently well documented will probably be playable forever - as opposed to physical stuff such as CDs.

If however you use DRM protected files, you are entirely at the mercy of the issuing company anyway.

Richard Mellish: absolutely agreed. And, by the way, keep social distance, wash your hands and wear a mask etc.

Mudcat has many members who know more than I do, and some others who tend to make risky statements (- can even happen to me and other honest persons).