To be honest DRMed music is/was a very new thing, because before being able to (leagaly) download music you bought CDs (or similar). At these days there where on purpose no legal way to download things so there wasn't realy a need for DRM. There was also any real speed for downloading things. A 3,5 MB low quality mp3 needed 20 to 30 minutes do download. Hence the music industrie wasn't even convinced or unwilling to see that they could make a profit from distributing music online.
Maybe I did not phrase my question clear enough or we simply misunderstood each other: History question, yes, but not from the CD/modem era but from the era when the iTunes, Zune and Sony stores sold DRMed music and crackers and music distributors played the cat and mouse game, as quoted by Ste Jobs in his article.