Licensed, not bought. Different things here folks.
Licensed for unlimited private use, hence not to be charged for another time. If this is not clear and still leaves the music industry in the position to charge you again every time you transfer your music to a new device, maybe it is time for a more customer-friendly legislation.
If it's a true license (to play and copy music privately), it should be independent from the source or medium.
How many people have to buy a digital download, because the CD they bought earlier is copy-protected? How many people have to buy a CD because the digital download is DRM-infected? How much of your yearly iTunes Match fee is going directly to the music industry to pay for music you
licensed years ago by buying the CD?
It is time for the industry to give us an open and independent media licensing system, for instance run by a non-profit organisation representing the industry as well as consumer organisations such as the EFF. Maybe like UltraViolet (
http://en.wikipedia.org/wiki/UltraViolet_(system)) without the DRM-crap. But I guess that is not in the industry's interest, because they want to charge us again when the first audio CDs chemically disolve in 20 years or when a large DRM-server is destroyed in a fire.
Imagine this for a moment: You buy a license for a song, a movie, a book. On average, you pay $0.79 for a song, $7.90 for a movie and $9.90 for a 300 page book. You get a key which allows you to obtain a digital copy in the highest available quality from a server. In addition you can purchase a hard-copy of a CD/Blu-ray or as a printed book for $1.50/$2.50/$7.50, just as you find them in regular stores. All major cloud services already host copies of all this media, so you only need your personal key to stream online. Improved versions of the media (remastered Audio, 4K-video, etc.) of course comes at a small upgrade fee. And of course you are allowed to resell all your obtained licences, but not separately from the CD/Blu-ray/Book.
Highly unlikely, I know. It is the double- and triple-charging that keeps a mostly dead industry alive.