None of the major online music services allow unlimited sharing (of files), and even getting this far was a long legal mess, representing part of the extensive history where DRM has attempted to parasitize the legal system.
http://arstechnica.com/tech-policy/2011/07/are-google-music-...
Another form of DRM in the industry is a pre-emptive fee charged on certain blank digital media: http://torrentfreak.com/where-the-riaa-gets-its-money/
I work for a small record label in my spare time. We submitted a song for pressing (on vinyl), and received a warning from the RIAA not to sell it. The record contained a (very interpreted) cover of a pop song.
DRM at every level of the industry. The lack of direct software enforcement in digital music files really doesn't mean anything.