A user called "viodentia" on the the doom9.org message boards has posted links to a program called FairUse4WM that is capable of cracking Microsoft's DRM 10, which protects files offered by PlaysForSure-commpatible music stores. The program is an easy-to-use front end to an app called drmbg that strips DRM headers from "secure" WMA files. Although he apparently developed the program to allow people to play their legally purchased music on the device of their choice, the potential for abuse is fairly high.
For instance, you could become a Napster To Go subscriber for one month (or even sign up for a free trial) and download thousands upon thousands of subscription tracks, then run FairUse4WM on the files to liberate them from their DRM. This would leave you with a massive collection of unprotected WMA tracks that would continue to play long after you stop paying for your subscription.
Even if Microsoft were to succeed in shutting down the forum where the links were originally posted, the file is already too widely-available for Microsoft to stop its distribution (several mirrors have been established). FairUse4WM only runs on Windows, and you need to have Windows Media Player 10 or 11 installed in order for it to work.
From what I understand, Microsoft's upcoming Zune music service will offer songs that run on more or less same technology as PlaysForSure (although Zune-purchased songs will not play on PlaysForSure devices and vice versa). That means that FairUse4WM could not only be another nail in PlaysForSure's coffin, but it could also threaten the Zune launch.
