With DRMed digital media, backed by the DMCA, nothing plays for sure. Please, somebody start THAT campaign, rather than playing these silly games. Your digital media is forever tethered to the DRM owners and relevant copyright holders. Your digital media plays the way they say it can be played, that’s for sure. But you will never truly be able to use your digital media however you want on whatever device you want – we will never see true interoperability.
Related: Slashdot’s Microsoft Portable Media Center Reviewed