This is the sort of English up with which I shall not put - Winston Churchill
Songs sold without an DRM will have a user's full name and account e-mail embedded in them. The big idea is that if you stick the DRM-free song on your favourite P2P network it could come back to get you.
While this could be seen as a good thing, it appears that the details embedded in the file include some scary amount of personal data including all your iTunes account information.
The only way to be sure is to convert selections to MP3, but there will be a generational loss in quality resulting from the transcoding.
The question is why Apple would want that level of detail? As Ars Technica points out, this information can be spoofed and if you really do not like someone you could release music onto a P2P site with their information on it.
It has asked Apple what it wants all this information for and the outfit has characteristically refused to comment.
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