Nokia has not mentioned what content will be readily available to its two mobile devices slated for digital rights lockdown or which file formats will be acceptable for the devices to play. It could potentially have quite a few key formats to knock around as PlayReady, Microsoft's DRM software, already supports taking the fun out of WMA, WMV, AAC, AAC+, AMR and H.264.
Series 60 from Nokia is a Graphical User Interface (GUI) and application layer protocol developed so that it could operate on the Symbian operating system. The Series 40, alternatively is a phone based protocol which accesses Nokia's own private operating system which is in use in most Nokia phones already. From Microsoft's point of view, they're already poised to deliver a fine product for Nokia as PlayReady is compatible with Windows Media DRM 10, which claims that it will allow PlayReady devices to access existing DRM encoded media.
Source:
Register