Just when we though online music sales were in the clear, along come "dirty MP3 files." The idea is that some vendors, who know your personal information as a result of payment data, insert a purchaser record into the MP3. This information is intended to be used in an as yet unannounced future digital trights management (DRM) system. So the "DRM-free" MP3s you bought from iTubes or WalMart you thought would always work on your iPod may, at some time in the future, suddenly stop working. Here's a chart indicating which retailers are selling dirty data. Via Miguel Guhlin.
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