From my understanding you don’t technically own most media (music, movies, software) regardless of the format. It’s a license. Even if you purchase a CD or DVD, etc.
There may technically be a license attached to them, but there is no practical way for any company to revoke my usage of them and the failure mode if any of those companies cease to exist is for them to continue working.
> Just remember anything you purchase on Amazon Prime, you don't practically own it.