It was a seemingly watershed moment in iTunes history. Earlier this year, Apple finally broke down and did away with their previously iron-clad pricing structure of .99 for any song in the iTunes catalog. Instead, they introduced their “iTunes Variable Pricing”, meaning that you might pay any of .66, .99, or $1.29 for a tune. But what makes this really interesting is that, in addition, now the entirety of Apple’s iTunes music catalog has lost the Apple-proprietary digital rights management (DRM) and is DRM-free, which is the + in “iTunes Plus”.