In most copyright doctrines you cannot -- even if you have bought the identical CD -- download mp3s extracted from other copies of it, if the author does not explicitely allow it. (Those other copies are counterfeit goods)
Without an agreement with the author, you cannot make copies of a copy you have bought legally, for he (or more exactly, the copyright-holders) is the only one allowed to make further copies.
Since this would make playing CDs on a computer impossible laws provide exceptions for the purposes of playing your legally bought representation (copies are made in cache memory, buffers etc...)
Other exceptions may be given (fair use doctrine, explicit mentions in other countries) letting you arrange a performance of the work (playing the CD) inside your private circle. (This would be impossible to enforce against)
So it stands to logic that if you have bought say, a vinyl of a particular work, you do not have a right to obtain counterfeit copies made of other representations (of the same work) as CDs or digital files.
Without an agreement with the author, you cannot make copies of a copy you have bought legally, for he (or more exactly, the copyright-holders) is the only one allowed to make further copies.
Since this would make playing CDs on a computer impossible laws provide exceptions for the purposes of playing your legally bought representation (copies are made in cache memory, buffers etc...)
Other exceptions may be given (fair use doctrine, explicit mentions in other countries) letting you arrange a performance of the work (playing the CD) inside your private circle. (This would be impossible to enforce against)
So it stands to logic that if you have bought say, a vinyl of a particular work, you do not have a right to obtain counterfeit copies made of other representations (of the same work) as CDs or digital files.