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Warner Music has struck a deal to bring its entire back catalog, free of copying restrictions, to the Amazon MP3 store. (New releases from artists like Josh Groban are not included.) This brings the total number of songs available on Amazon to 2.9 million, and strikes another blow at Steve Jobs's quest to remove digital rights management code, or DRM, from iTunes music. So far, only EMI and a number of independent labels allow Apple to sell music in the DRM-free MP3 format. The theory is that the other music labels are willing to allow Amazon.com to sell DRM-free music in an attempt to break Apple's stranglehold on the digital distribution of music. Of course, they're hardly hurting Jobs, since Apple's iPods can play Amazon-sold MP3 files. Did we mention that the music industry is run by self-defeating idiots?