iTunes 4.5 DRM cracked

I think this is an encouraging sign. For a while now the rhetoric around copy-protection has been that no DRM scheme will prevent piracy because they will all be cracked in short order. But most DRM formats have gone for a long time without any high-profile tool for converting them to unprotected formats. Now it seems that the DRM arms race has begun, with the iTunes 4.5 format being cracked within 24 hours of its release. How long will this have to go on before the media industries give up on DRM?