The whole rental business is foolish. Most purchasers of music will copy it to a computer for themselves regardless of the producers wishes as this normal for all music purchases, and permitted under federal copyright law.
People don’t read the small clause and when they do they assume it’s that they may copy it as long as they don’t share it.
Aderet knows that putting it written apparent manner (like in big letters in front) will reduce sales from honest people.
Once it’s off the cd (permissible or not) and in a computer or mp3 player then the original rental agreement loophole does not apply to a dishonest person who copies it for themselves.
Therefore the music industry must rely on people being honest and paying to benefit from someone else’s labor, rather than trying create ways to force people to limit rights in purchases.