Personally, I was never really bothered by iTunes embedding my email address in the track metadata though many users lathered themselves into a frothy frenzy.
Privatunes is a tool for Mac and Windows that erases personal information from your legally purchased iTunes Plus tracks. Just select the song you want to anonymize and Privatunes will do the rest. The tool also allows you to backup the original file just in case. Unfortunately there is no batch processing at the moment so you need to convert each file manually.
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