Unless you are dealing with the artist directly, you are always dealing with a middle man. Make no mistake, the current distributors would love nothing more than the ability to cancel rights on any music you already think you own. There is some exec right now looking at video games that phone home before each play and thinking he wants to make that work with the music his company distributes.
Music that phones home is old news. Windows Media DRMed files had to contact a licensing server to obtain a key to play the files, and this was in 1999.
From the computer yes. But with smart phone usage growing and every music player having wifi now, the idea could work good enough that many people no longer notice. Until of course their music license is revoked.
