On the issue of portability of music purchased from the iTunes Store, reader Hanno zur Loye writes in:
I read the article by Christopher Breen (“How to deal with two Apple IDs, well, kind of”) and I was hopeful and confused at this statement of “…if we’re talking only about music you’ve purchased from the iTunes Store in the last several years, that’s not a problem as music is no longer protected and can be played with either ID.”
I just realized that due to a change in email addresses, I have two Apple IDs and have purchased music on both and apps only on the later one, since that came with the iPhone that runs on the new email address. I just tried to listen to purchased music and it won’t let me play it unless I sign in on the Apple ID that purchased it. So it seems that the music is protected? Or am I doing something wrong.
Read more here:: How to consolidate locked iTunes music linked to multiple accounts