Word is mounting about Microsoft's next-gen DRM scheme, code-named Janus. Jupiter Research has described Janus as "secure clock DRM technology that will enable songs in a subscription service to be moved onto a device," in the words of analyst David Card. "The song expires if the user's subscription runs out." Now, BetaNews has more info on Janus, noting that the technology will be baked into MSN's online music service, which is expected to debut this fall.