Apple of course no longer sells DRM-encoded music through the iTunes Store, but the lawsuit argues that Apple sought to build monopolies in the digital music and portable music player markets by integrating its products and services while preventing interoperability with competitors' products.
That's complete BS. As you can read quotes from Steve Jobs back in the 2000 era, he never wanted to offer DRM music or subscription based music, the music studios forced it on them at that time. He hated the idea of DRM.