You are breaking the law when you rip the cd and THEN sell the disc. You can rip it and keep it. It's your music you paid for. But, it's when you rip it and then sell it to someone else that it is illegal.
Regarding used cd stores: when I sell a used cd to a store, I don't own the music anymore. They can sell to someone else because it hasn't been copied. Now, does that mean used cd stores don't sell discs that have been ripped? Absolutely not. No one has any idea whether a used disc has been ripped or not. But, that alone doesn't make it legal.
Regarding used cd stores: when I sell a used cd to a store, I don't own the music anymore. They can sell to someone else because it hasn't been copied. Now, does that mean used cd stores don't sell discs that have been ripped? Absolutely not. No one has any idea whether a used disc has been ripped or not. But, that alone doesn't make it legal.