bodypainter said:
Songs purchased from the iTunes Music Store won't play on an unauthorized computer.
Are you sure?
From
Wikipedia.
Music sharing
iTunes Library songs can be shared over a local network using Bonjour (formerly Rendezvous)—Apple's implementation of the Zeroconf (zero configuration required) open network standard—which allows shared lists of songs within the same subnet to be automatically detected. When a song is shared, iTunes can stream the song but won't save it on the local hard drive, in order to prevent copying. Songs in Protected AAC format can also be accessed but authentication is required.
Originally with iTunes 4.0, users could freely access shared music anywhere over the internet, in addition to one's own subnet, by specifying IP addresses of remote shared song libraries. Apple quickly removed this feature with version 4.0.1, claiming that users were violating the EULA.
Music sharing uses the Digital Audio Access Protocol (DAAP), created by Apple for this purpose. [2] DAAP has been reverse-engineered and is now used to stream playlists from non-Apple software.
Just days after the Windows version of iTunes was released, William Zeller, a 20-year-old Trinity College student, wrote myTunes, a program which allows Windows users to circumvent the iTunes restriction and download music from an iTunes shared playlist over a network. MyTunes quickly became popular and is now widely used. There also exists a similar open source Java client, called ourTunes. Yet another approach is used by iSyncTunes. This application does not use DAAP and only depends on external interfaces to transfer music between computers. It transfers the songs, saves them on the local hard drive and creates a song list that can be imported into your local library.