Apple puts buyer information in DRM free tracks

A lot of people have celebrated the decision by Apple and EMI to provide DRM free audio tracks through iTunes (even if they cost 30 cents extra). But suddenly, when there was some amount of excitement among anti-DRM users, Apple has caused some amount of caution. It has been discovered that users who buy DRM free files are getting files that have their user names and email id's embedded in the files.
Users who download the latest update for iTunes, version 7.2 have got the ability to buy DRM free files. But analysis of these files have disclosed that these files have user information embedded in an unencrypted form. This should not harm anyone in an obvious manner.
However, for users who are going to share these files, analysis of these files will easily disclose the original buyer of these files, and know that these files have been shared, something that is still not legally permitted. However, Apple is not disclosing the reasons why these files carry the user information, something which makes privacy experts queasy. So, even though Apple has made files DRM free, it still wants to make sure that it has a way of tracking any movement of these files. Maybe this could have been part of the agreement with EMI.
Refer this article:

An Apple spokesman suggested by e-mail that Wired News contact Michael Gartenberg, an analyst at Jupiter Research who has been briefed about iTunes Plus. The Apple spokesman didn't respond to further requests for comment.
Gartenberg said there are many reasons why Apple would want to tag music sold through the iTunes store. The information could be used as a proof of purchase, or to facilitate upgrades (songs previously bought through iTunes can be upgraded to higher fidelity versions for an extra 30 cents). The identifier could help identify songs missing from albums (iTunes offers a "complete album" feature), as well as to thwart piracy.

The silence by Apple is puzzling. It does not solve any immediate need, and Apple would have expected that this would easily have been found, and they did not have a canned reply. Seems a bit strange.