When you buy a CD it's not even your right to be able to play it wherever you want.

So you might not be able to play it in your discman or car and have no legal options whatsoever.

Retailers usually take it back although they don't have to.

The music industry really screwed things and many of their "rules" are unconstitutional in many countries, but it's a huge lobby and court cases take years, so many don't bother.

I would especially blame Sony and Bertelsmann, they even place rootkits on their CDs infecting PCs.